diff --git a/Cargo.lock b/Cargo.lock
index fa644f4..8c5b576 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -12049,6 +12049,7 @@ dependencies = [
  "wasm-bindgen-futures",
  "weaver-api",
  "weaver-common",
+ "weaver-editor-core",
  "weaver-renderer",
  "web-sys",
  "web-time",
diff --git a/crates/weaver-app/Cargo.toml b/crates/weaver-app/Cargo.toml
index 9d6dfe7..d242b8e 100644
--- a/crates/weaver-app/Cargo.toml
+++ b/crates/weaver-app/Cargo.toml
@@ -48,6 +48,7 @@ dashmap = "6.1.0"
 
 dioxus = { version = "0.7.1", features = ["router"] }
 weaver-common = { path = "../weaver-common" }
+weaver-editor-core = { path = "../weaver-editor-core" }
 jacquard = { workspace = true}#, features = ["streaming"] }
 jacquard-lexicon = { workspace = true }
 jacquard-identity = { workspace = true }
diff --git a/crates/weaver-app/src/components/editor/actions.rs b/crates/weaver-app/src/components/editor/actions.rs
index 3758e99..072502d 100644
--- a/crates/weaver-app/src/components/editor/actions.rs
+++ b/crates/weaver-app/src/components/editor/actions.rs
@@ -753,7 +753,7 @@ pub fn execute_action(doc: &mut EditorDocument, action: &EditorAction) -> bool {
     use super::input::{
         detect_list_context, find_line_end, find_line_start, get_char_at, is_list_item_empty,
     };
-    use super::offset_map::SnapDirection;
+    use weaver_editor_core::SnapDirection;
 
     match action {
         EditorAction::Insert { text, range } => {
diff --git a/crates/weaver-app/src/components/editor/component.rs b/crates/weaver-app/src/components/editor/component.rs
index d52510c..15f6ef3 100644
--- a/crates/weaver-app/src/components/editor/component.rs
+++ b/crates/weaver-app/src/components/editor/component.rs
@@ -15,7 +15,6 @@ use super::dom_sync::update_paragraph_dom;
 use super::dom_sync::{sync_cursor_from_dom, sync_cursor_from_dom_with_direction};
 use super::formatting;
 use super::input::{get_char_at, handle_copy, handle_cut, handle_paste};
-use super::offset_map::SnapDirection;
 use super::paragraph::ParagraphRender;
 use super::platform;
 #[allow(unused_imports)]
@@ -45,6 +44,7 @@ use jacquard::types::blob::BlobRef;
 use jacquard::types::ident::AtIdentifier;
 use weaver_api::sh_weaver::embed::images::Image;
 use weaver_common::WeaverExt;
+use weaver_editor_core::SnapDirection;
 
 /// Result of loading document state.
 enum LoadResult {
@@ -1868,7 +1868,7 @@ fn RemoteCursorIndicator(
     position: usize,
     selection: Option<(usize, usize)>,
     color: u32,
-    offset_map: Vec<super::offset_map::OffsetMapping>,
+    offset_map: Vec<weaver_editor_core::OffsetMapping>,
 ) -> Element {
     use super::cursor::{get_cursor_rect_relative, get_selection_rects_relative};
 
diff --git a/crates/weaver-app/src/components/editor/cursor.rs b/crates/weaver-app/src/components/editor/cursor.rs
index 3ea6207..0869ea5 100644
--- a/crates/weaver-app/src/components/editor/cursor.rs
+++ b/crates/weaver-app/src/components/editor/cursor.rs
@@ -7,9 +7,9 @@
 //! 3. Walking text nodes to find the UTF-16 offset within the element
 //! 4. Setting cursor with web_sys Selection API
 
-use super::offset_map::OffsetMapping;
+use weaver_editor_core::OffsetMapping;
 #[cfg(all(target_family = "wasm", target_os = "unknown"))]
-use super::offset_map::{SnapDirection, find_mapping_for_char, find_nearest_valid_position};
+use weaver_editor_core::{SnapDirection, find_mapping_for_char, find_nearest_valid_position};
 
 #[cfg(all(target_family = "wasm", target_os = "unknown"))]
 use wasm_bindgen::JsCast;
diff --git a/crates/weaver-app/src/components/editor/document.rs b/crates/weaver-app/src/components/editor/document.rs
index e98ce76..ce7432d 100644
--- a/crates/weaver-app/src/components/editor/document.rs
+++ b/crates/weaver-app/src/components/editor/document.rs
@@ -144,7 +144,7 @@ pub struct EditorDocument {
 
     /// Pending snap direction for cursor restoration after edits.
     /// Set by input handlers, consumed by cursor restoration.
-    pub pending_snap: Signal<Option<super::offset_map::SnapDirection>>,
+    pub pending_snap: Signal<Option<weaver_editor_core::SnapDirection>>,
 
     /// Collected refs (wikilinks, AT embeds) from the most recent render.
     /// Updated by the render pipeline, read by publish for populating records.
diff --git a/crates/weaver-app/src/components/editor/dom_sync.rs b/crates/weaver-app/src/components/editor/dom_sync.rs
index d1bc22c..2213d1e 100644
--- a/crates/weaver-app/src/components/editor/dom_sync.rs
+++ b/crates/weaver-app/src/components/editor/dom_sync.rs
@@ -8,7 +8,7 @@ use super::cursor::restore_cursor_position;
 #[allow(unused_imports)]
 use super::document::{EditorDocument, Selection};
 #[allow(unused_imports)]
-use super::offset_map::{SnapDirection, find_nearest_valid_position, is_valid_cursor_position};
+use weaver_editor_core::{SnapDirection, find_nearest_valid_position, is_valid_cursor_position};
 use super::paragraph::ParagraphRender;
 #[allow(unused_imports)]
 use dioxus::prelude::*;
diff --git a/crates/weaver-app/src/components/editor/input.rs b/crates/weaver-app/src/components/editor/input.rs
index 2f3bc60..5cd9484 100644
--- a/crates/weaver-app/src/components/editor/input.rs
+++ b/crates/weaver-app/src/components/editor/input.rs
@@ -6,7 +6,7 @@ use dioxus::prelude::*;
 
 use super::document::EditorDocument;
 use super::formatting::{self, FormatAction};
-use super::offset_map::SnapDirection;
+use weaver_editor_core::SnapDirection;
 
 /// Check if we need to intercept this key event.
 /// Returns true for content-modifying operations, false for navigation.
diff --git a/crates/weaver-app/src/components/editor/mod.rs b/crates/weaver-app/src/components/editor/mod.rs
index bec51bd..408c504 100644
--- a/crates/weaver-app/src/components/editor/mod.rs
+++ b/crates/weaver-app/src/components/editor/mod.rs
@@ -15,7 +15,6 @@ mod formatting;
 mod image_upload;
 mod input;
 mod log_buffer;
-mod offset_map;
 mod paragraph;
 mod platform;
 mod publish;
@@ -54,15 +53,19 @@ pub use document::{
 #[allow(unused_imports)]
 pub use formatting::{FormatAction, apply_formatting, find_word_boundaries};
 
-// Rendering
+// Rendering - re-export core types
 #[allow(unused_imports)]
-pub use offset_map::{OffsetMapping, RenderResult, find_mapping_for_byte};
+pub use weaver_editor_core::{
+    EditorRope, EditorWriter, EmbedContentProvider, ImageResolver, OffsetMapping, RenderResult,
+    SegmentedWriter, SyntaxSpanInfo, SyntaxType, TextBuffer, WriterResult, find_mapping_for_byte,
+};
 #[allow(unused_imports)]
 pub use paragraph::ParagraphRender;
 #[allow(unused_imports)]
 pub use render::{RenderCache, render_paragraphs_incremental};
+// App-specific image resolver
 #[allow(unused_imports)]
-pub use writer::{EditorImageResolver, ImageResolver, SyntaxSpanInfo, SyntaxType, WriterResult};
+pub use writer::embed::EditorImageResolver;
 
 // Storage
 #[allow(unused_imports)]
diff --git a/crates/weaver-app/src/components/editor/offset_map.rs b/crates/weaver-app/src/components/editor/offset_map.rs
deleted file mode 100644
index 41636c8..0000000
--- a/crates/weaver-app/src/components/editor/offset_map.rs
+++ /dev/null
@@ -1,530 +0,0 @@
-//! Offset mapping between source text and rendered DOM.
-//!
-//! When rendering markdown to HTML, some characters disappear (table pipes)
-//! and content gets split across nodes (syntax highlighting). Offset maps
-//! track how source byte positions map to DOM node positions.
-
-use std::ops::Range;
-
-/// Result of rendering markdown with offset tracking.
-#[derive(Debug, Clone, PartialEq)]
-pub struct RenderResult {
-    /// Rendered HTML string
-    pub html: String,
-
-    /// Mappings from source bytes to DOM positions
-    pub offset_map: Vec<OffsetMapping>,
-}
-
-/// Maps a source range to a position in the rendered DOM.
-///
-/// # Example
-///
-/// Source: `| foo | bar |`
-/// Bytes:   0  2-5  7-10 12
-/// Chars:   0  2-5  7-10 12 (ASCII, so same)
-///
-/// Rendered:
-/// ```html
-/// <table id="t0">
-///   <tr><td id="t0-c0">foo</td><td id="t0-c1">bar</td></tr>
-/// </table>
-/// ```
-///
-/// Mappings:
-/// - `{ byte_range: 0..2, char_range: 0..2, node_id: "t0-c0", char_offset_in_node: 0, utf16_len: 0 }` - "| " invisible
-/// - `{ byte_range: 2..5, char_range: 2..5, node_id: "t0-c0", char_offset_in_node: 0, utf16_len: 3 }` - "foo" visible
-/// - `{ byte_range: 5..7, char_range: 5..7, node_id: "t0-c0", char_offset_in_node: 3, utf16_len: 0 }` - " |" invisible
-/// - etc.
-#[derive(Debug, Clone, PartialEq)]
-pub struct OffsetMapping {
-    /// Source byte range (UTF-8 bytes, from parser)
-    pub byte_range: Range<usize>,
-
-    /// Source char range (Unicode scalar values, for rope indexing)
-    pub char_range: Range<usize>,
-
-    /// DOM node ID containing this content
-    /// For invisible content, this is the nearest visible container
-    pub node_id: String,
-
-    /// Position within the node
-    /// - If child_index is Some: cursor at that child index in the element
-    /// - If child_index is None: UTF-16 offset in text content
-    pub char_offset_in_node: usize,
-
-    /// If Some, position cursor at this child index in the element (not in text)
-    /// Used for positions after <br /> or at empty lines
-    pub child_index: Option<usize>,
-
-    /// Length of this mapping in UTF-16 chars in DOM
-    /// If 0, these source bytes aren't rendered (table pipes, etc)
-    pub utf16_len: usize,
-}
-
-impl OffsetMapping {
-    /// Check if this mapping contains the given byte offset
-    pub fn contains_byte(&self, byte_offset: usize) -> bool {
-        self.byte_range.contains(&byte_offset)
-    }
-
-    /// Check if this mapping contains the given char offset
-    pub fn contains_char(&self, char_offset: usize) -> bool {
-        self.char_range.contains(&char_offset)
-    }
-
-    /// Check if this mapping represents invisible content
-    pub fn is_invisible(&self) -> bool {
-        self.utf16_len == 0
-    }
-}
-
-/// Find the offset mapping containing the given byte offset.
-///
-/// Returns the mapping and whether the cursor should snap to the next
-/// visible position (for invisible content).
-pub fn find_mapping_for_byte(
-    offset_map: &[OffsetMapping],
-    byte_offset: usize,
-) -> Option<(&OffsetMapping, bool)> {
-    // Binary search for the mapping
-    // Note: We allow cursor at the end boundary of a mapping (cursor after text)
-    let idx = offset_map
-        .binary_search_by(|mapping| {
-            if mapping.byte_range.end < byte_offset {
-                std::cmp::Ordering::Less
-            } else if mapping.byte_range.start > byte_offset {
-                std::cmp::Ordering::Greater
-            } else {
-                std::cmp::Ordering::Equal
-            }
-        })
-        .ok()?;
-
-    let mapping = &offset_map[idx];
-    let should_snap = mapping.is_invisible();
-
-    Some((mapping, should_snap))
-}
-
-/// Find the offset mapping containing the given char offset.
-///
-/// This is the primary lookup method for cursor restoration, since
-/// cursor positions are tracked as char offsets in the rope.
-///
-/// Returns the mapping and whether the cursor should snap to the next
-/// visible position (for invisible content).
-#[allow(dead_code)]
-pub fn find_mapping_for_char(
-    offset_map: &[OffsetMapping],
-    char_offset: usize,
-) -> Option<(&OffsetMapping, bool)> {
-    // Binary search for the mapping
-    // Rust ranges are end-exclusive, so range 0..10 covers positions 0-9.
-    // When cursor is exactly at a boundary (e.g., position 10 between 0..10 and 10..20),
-    // prefer the NEXT mapping so cursor goes "down" to new content.
-    let result = offset_map.binary_search_by(|mapping| {
-        if mapping.char_range.end <= char_offset {
-            // Cursor is at or after end of this mapping - look forward
-            std::cmp::Ordering::Less
-        } else if mapping.char_range.start > char_offset {
-            // Cursor is before this mapping
-            std::cmp::Ordering::Greater
-        } else {
-            // Cursor is within [start, end)
-            std::cmp::Ordering::Equal
-        }
-    });
-
-    let mapping = match result {
-        Ok(idx) => &offset_map[idx],
-        Err(idx) => {
-            // No exact match - cursor is at boundary between mappings (or past end)
-            // If cursor is exactly at end of previous mapping, return that mapping
-            // This handles cursor at end of document or end of last mapping
-            if idx > 0 && offset_map[idx - 1].char_range.end == char_offset {
-                &offset_map[idx - 1]
-            } else {
-                return None;
-            }
-        }
-    };
-
-    let should_snap = mapping.is_invisible();
-    Some((mapping, should_snap))
-}
-
-/// Direction hint for cursor snapping.
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-pub enum SnapDirection {
-    Backward,
-    Forward,
-}
-
-/// Result of finding a valid cursor position.
-#[derive(Debug, Clone)]
-#[allow(dead_code)]
-pub struct SnappedPosition<'a> {
-    pub mapping: &'a OffsetMapping,
-    pub offset_in_mapping: usize,
-    pub snapped: Option<SnapDirection>,
-}
-
-#[allow(dead_code)]
-impl SnappedPosition<'_> {
-    /// Get the absolute char offset for this position.
-    pub fn char_offset(&self) -> usize {
-        self.mapping.char_range.start + self.offset_in_mapping
-    }
-}
-
-/// Find the nearest valid cursor position to a char offset.
-///
-/// A valid position is one that maps to visible content (utf16_len > 0).
-/// If the position is already valid, returns it directly. Otherwise,
-/// searches in the preferred direction first, falling back to the other
-/// direction if needed.
-#[allow(dead_code)]
-pub fn find_nearest_valid_position(
-    offset_map: &[OffsetMapping],
-    char_offset: usize,
-    preferred_direction: Option<SnapDirection>,
-) -> Option<SnappedPosition<'_>> {
-    if offset_map.is_empty() {
-        return None;
-    }
-
-    // Try exact match first
-    if let Some((mapping, should_snap)) = find_mapping_for_char(offset_map, char_offset) {
-        if !should_snap {
-            // Position is valid, return it directly
-            let offset_in_mapping = char_offset.saturating_sub(mapping.char_range.start);
-            return Some(SnappedPosition {
-                mapping,
-                offset_in_mapping,
-                snapped: None,
-            });
-        }
-    }
-
-    // Position is invalid or not found - search for nearest valid
-    let search_order = match preferred_direction {
-        Some(SnapDirection::Backward) => [SnapDirection::Backward, SnapDirection::Forward],
-        Some(SnapDirection::Forward) | None => [SnapDirection::Forward, SnapDirection::Backward],
-    };
-
-    for direction in search_order {
-        if let Some(pos) = find_valid_in_direction(offset_map, char_offset, direction) {
-            return Some(pos);
-        }
-    }
-
-    None
-}
-
-/// Search for a valid position in a specific direction.
-#[allow(dead_code)]
-fn find_valid_in_direction(
-    offset_map: &[OffsetMapping],
-    char_offset: usize,
-    direction: SnapDirection,
-) -> Option<SnappedPosition<'_>> {
-    match direction {
-        SnapDirection::Forward => {
-            // Find first visible mapping at or after char_offset
-            for mapping in offset_map {
-                if mapping.char_range.start >= char_offset && !mapping.is_invisible() {
-                    return Some(SnappedPosition {
-                        mapping,
-                        offset_in_mapping: 0,
-                        snapped: Some(SnapDirection::Forward),
-                    });
-                }
-                // Also check if char_offset falls within this visible mapping
-                if mapping.char_range.contains(&char_offset) && !mapping.is_invisible() {
-                    let offset_in_mapping = char_offset - mapping.char_range.start;
-                    return Some(SnappedPosition {
-                        mapping,
-                        offset_in_mapping,
-                        snapped: Some(SnapDirection::Forward),
-                    });
-                }
-            }
-            None
-        }
-        SnapDirection::Backward => {
-            // Find last visible mapping at or before char_offset
-            for mapping in offset_map.iter().rev() {
-                if mapping.char_range.end <= char_offset && !mapping.is_invisible() {
-                    // Snap to end of this mapping
-                    let offset_in_mapping = mapping.char_range.len();
-                    return Some(SnappedPosition {
-                        mapping,
-                        offset_in_mapping,
-                        snapped: Some(SnapDirection::Backward),
-                    });
-                }
-                // Also check if char_offset falls within this visible mapping
-                if mapping.char_range.contains(&char_offset) && !mapping.is_invisible() {
-                    let offset_in_mapping = char_offset - mapping.char_range.start;
-                    return Some(SnappedPosition {
-                        mapping,
-                        offset_in_mapping,
-                        snapped: Some(SnapDirection::Backward),
-                    });
-                }
-            }
-            None
-        }
-    }
-}
-
-/// Check if a char offset is at a valid (non-invisible) cursor position.
-#[allow(dead_code)]
-pub fn is_valid_cursor_position(offset_map: &[OffsetMapping], char_offset: usize) -> bool {
-    find_mapping_for_char(offset_map, char_offset)
-        .map(|(m, should_snap)| !should_snap && m.utf16_len > 0)
-        .unwrap_or(false)
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_find_mapping_by_byte() {
-        let mappings = vec![
-            OffsetMapping {
-                byte_range: 0..2,
-                char_range: 0..2,
-                node_id: "n0".to_string(),
-                char_offset_in_node: 0,
-                child_index: None,
-                utf16_len: 0, // invisible
-            },
-            OffsetMapping {
-                byte_range: 2..5,
-                char_range: 2..5,
-                node_id: "n0".to_string(),
-                char_offset_in_node: 0,
-                child_index: None,
-                utf16_len: 3,
-            },
-            OffsetMapping {
-                byte_range: 5..7,
-                char_range: 5..7,
-                node_id: "n0".to_string(),
-                char_offset_in_node: 3,
-                child_index: None,
-                utf16_len: 0, // invisible
-            },
-        ];
-
-        // Byte 0 (invisible)
-        let (mapping, should_snap) = find_mapping_for_byte(&mappings, 0).unwrap();
-        assert_eq!(mapping.byte_range, 0..2);
-        assert!(should_snap);
-
-        // Byte 3 (visible)
-        let (mapping, should_snap) = find_mapping_for_byte(&mappings, 3).unwrap();
-        assert_eq!(mapping.byte_range, 2..5);
-        assert!(!should_snap);
-
-        // Byte 6 (invisible)
-        let (mapping, should_snap) = find_mapping_for_byte(&mappings, 6).unwrap();
-        assert_eq!(mapping.byte_range, 5..7);
-        assert!(should_snap);
-    }
-
-    #[test]
-    fn test_find_mapping_by_char() {
-        let mappings = vec![
-            OffsetMapping {
-                byte_range: 0..2,
-                char_range: 0..2,
-                node_id: "n0".to_string(),
-                char_offset_in_node: 0,
-                child_index: None,
-                utf16_len: 0, // invisible
-            },
-            OffsetMapping {
-                byte_range: 2..5,
-                char_range: 2..5,
-                node_id: "n0".to_string(),
-                char_offset_in_node: 0,
-                child_index: None,
-                utf16_len: 3,
-            },
-            OffsetMapping {
-                byte_range: 5..7,
-                char_range: 5..7,
-                node_id: "n0".to_string(),
-                char_offset_in_node: 3,
-                child_index: None,
-                utf16_len: 0, // invisible
-            },
-        ];
-
-        // Char 0 (invisible)
-        let (mapping, should_snap) = find_mapping_for_char(&mappings, 0).unwrap();
-        assert_eq!(mapping.char_range, 0..2);
-        assert!(should_snap);
-
-        // Char 3 (visible)
-        let (mapping, should_snap) = find_mapping_for_char(&mappings, 3).unwrap();
-        assert_eq!(mapping.char_range, 2..5);
-        assert!(!should_snap);
-
-        // Char 6 (invisible)
-        let (mapping, should_snap) = find_mapping_for_char(&mappings, 6).unwrap();
-        assert_eq!(mapping.char_range, 5..7);
-        assert!(should_snap);
-    }
-
-    #[test]
-    fn test_contains_byte() {
-        let mapping = OffsetMapping {
-            byte_range: 10..20,
-            char_range: 10..20,
-            node_id: "test".to_string(),
-            char_offset_in_node: 0,
-            child_index: None,
-            utf16_len: 5,
-        };
-
-        assert!(!mapping.contains_byte(9));
-        assert!(mapping.contains_byte(10));
-        assert!(mapping.contains_byte(15));
-        assert!(mapping.contains_byte(19));
-        assert!(!mapping.contains_byte(20));
-    }
-
-    #[test]
-    fn test_contains_char() {
-        let mapping = OffsetMapping {
-            byte_range: 10..20,
-            char_range: 8..15, // emoji example: fewer chars than bytes
-            node_id: "test".to_string(),
-            char_offset_in_node: 0,
-            child_index: None,
-            utf16_len: 5,
-        };
-
-        assert!(!mapping.contains_char(7));
-        assert!(mapping.contains_char(8));
-        assert!(mapping.contains_char(12));
-        assert!(mapping.contains_char(14));
-        assert!(!mapping.contains_char(15));
-    }
-
-    fn make_test_mappings() -> Vec<OffsetMapping> {
-        vec![
-            OffsetMapping {
-                byte_range: 0..2,
-                char_range: 0..2,
-                node_id: "n0".to_string(),
-                char_offset_in_node: 0,
-                child_index: None,
-                utf16_len: 0, // invisible: "!["
-            },
-            OffsetMapping {
-                byte_range: 2..5,
-                char_range: 2..5,
-                node_id: "n0".to_string(),
-                char_offset_in_node: 0,
-                child_index: None,
-                utf16_len: 3, // visible: "alt"
-            },
-            OffsetMapping {
-                byte_range: 5..15,
-                char_range: 5..15,
-                node_id: "n0".to_string(),
-                char_offset_in_node: 3,
-                child_index: None,
-                utf16_len: 0, // invisible: "](url.png)"
-            },
-            OffsetMapping {
-                byte_range: 15..20,
-                char_range: 15..20,
-                node_id: "n0".to_string(),
-                char_offset_in_node: 3,
-                child_index: None,
-                utf16_len: 5, // visible: " text"
-            },
-        ]
-    }
-
-    #[test]
-    fn test_find_nearest_valid_position_exact_match() {
-        let mappings = make_test_mappings();
-
-        // Position 3 is in visible mapping (2..5)
-        let pos = find_nearest_valid_position(&mappings, 3, None).unwrap();
-        assert_eq!(pos.char_offset(), 3);
-        assert!(pos.snapped.is_none());
-    }
-
-    #[test]
-    fn test_find_nearest_valid_position_snap_forward() {
-        let mappings = make_test_mappings();
-
-        // Position 0 is invisible, should snap forward to 2
-        let pos = find_nearest_valid_position(&mappings, 0, Some(SnapDirection::Forward)).unwrap();
-        assert_eq!(pos.char_offset(), 2);
-        assert_eq!(pos.snapped, Some(SnapDirection::Forward));
-    }
-
-    #[test]
-    fn test_find_nearest_valid_position_snap_backward() {
-        let mappings = make_test_mappings();
-
-        // Position 10 is invisible (in 5..15), prefer backward to end of "alt" (position 5)
-        let pos =
-            find_nearest_valid_position(&mappings, 10, Some(SnapDirection::Backward)).unwrap();
-        assert_eq!(pos.char_offset(), 5); // end of "alt" mapping
-        assert_eq!(pos.snapped, Some(SnapDirection::Backward));
-    }
-
-    #[test]
-    fn test_find_nearest_valid_position_default_forward() {
-        let mappings = make_test_mappings();
-
-        // Position 0 is invisible, None direction defaults to forward
-        let pos = find_nearest_valid_position(&mappings, 0, None).unwrap();
-        assert_eq!(pos.char_offset(), 2);
-        assert_eq!(pos.snapped, Some(SnapDirection::Forward));
-    }
-
-    #[test]
-    fn test_find_nearest_valid_position_snap_forward_from_invisible() {
-        let mappings = make_test_mappings();
-
-        // Position 10 is in invisible range (5..15), forward finds visible (15..20)
-        let pos = find_nearest_valid_position(&mappings, 10, Some(SnapDirection::Forward)).unwrap();
-        assert_eq!(pos.char_offset(), 15);
-        assert_eq!(pos.snapped, Some(SnapDirection::Forward));
-    }
-
-    #[test]
-    fn test_is_valid_cursor_position() {
-        let mappings = make_test_mappings();
-
-        // Invisible positions
-        assert!(!is_valid_cursor_position(&mappings, 0));
-        assert!(!is_valid_cursor_position(&mappings, 1));
-        assert!(!is_valid_cursor_position(&mappings, 10));
-
-        // Visible positions
-        assert!(is_valid_cursor_position(&mappings, 2));
-        assert!(is_valid_cursor_position(&mappings, 3));
-        assert!(is_valid_cursor_position(&mappings, 4));
-        assert!(is_valid_cursor_position(&mappings, 15));
-        assert!(is_valid_cursor_position(&mappings, 17));
-    }
-
-    #[test]
-    fn test_find_nearest_valid_position_empty() {
-        let mappings: Vec<OffsetMapping> = vec![];
-        assert!(find_nearest_valid_position(&mappings, 0, None).is_none());
-    }
-}
diff --git a/crates/weaver-app/src/components/editor/paragraph.rs b/crates/weaver-app/src/components/editor/paragraph.rs
index 964f676..9212179 100644
--- a/crates/weaver-app/src/components/editor/paragraph.rs
+++ b/crates/weaver-app/src/components/editor/paragraph.rs
@@ -3,10 +3,9 @@
 //! Paragraphs are discovered during markdown rendering by tracking
 //! Tag::Paragraph events. This allows updating only changed paragraphs in the DOM.
 
-use super::offset_map::OffsetMapping;
-use super::writer::SyntaxSpanInfo;
 use loro::LoroText;
 use std::ops::Range;
+use weaver_editor_core::{OffsetMapping, SyntaxSpanInfo};
 
 /// A rendered paragraph with its source range and offset mappings.
 #[derive(Debug, Clone, PartialEq)]
diff --git a/crates/weaver-app/src/components/editor/render.rs b/crates/weaver-app/src/components/editor/render.rs
index 629488a..6b68429 100644
--- a/crates/weaver-app/src/components/editor/render.rs
+++ b/crates/weaver-app/src/components/editor/render.rs
@@ -5,15 +5,15 @@
 //! Uses EditorWriter which tracks gaps in offset_iter to preserve formatting characters.
 
 use super::document::EditInfo;
-#[allow(unused_imports)]
-use super::offset_map::{OffsetMapping, RenderResult};
 use super::paragraph::{ParagraphRender, hash_source, make_paragraph_id, text_slice_to_string};
-#[allow(unused_imports)]
-use super::writer::{EditorImageResolver, EditorWriter, ImageResolver, SyntaxSpanInfo};
+use super::writer::embed::EditorImageResolver;
 use loro::LoroText;
 use markdown_weaver::Parser;
 use std::ops::Range;
 use weaver_common::{EntryIndex, ResolvedContent};
+use weaver_editor_core::{
+    EditorRope, EditorWriter, EmbedContentProvider, ImageResolver, OffsetMapping, SyntaxSpanInfo,
+};
 
 /// Cache for incremental paragraph rendering.
 /// Stores previously rendered paragraphs to avoid re-rendering unchanged content.
@@ -413,18 +413,17 @@ pub fn render_paragraphs_incremental(
                 let parser = Parser::new_ext(&para_source, weaver_renderer::default_md_options())
                     .into_offset_iter();
 
-                let para_doc = loro::LoroDoc::new();
-                let para_text = para_doc.get_text("content");
-                let _ = para_text.insert(0, &para_source);
+                let para_rope = EditorRope::from(para_source.as_str());
 
-                let mut writer = EditorWriter::<_, &ResolvedContent, &EditorImageResolver>::new(
-                    &para_source,
-                    &para_text,
-                    parser,
-                )
-                .with_node_id_prefix(&cached_para.id)
-                .with_image_resolver(&resolver)
-                .with_embed_provider(resolved_content);
+                let mut writer =
+                    EditorWriter::<_, _, &ResolvedContent, &EditorImageResolver, ()>::new(
+                        &para_source,
+                        &para_rope,
+                        parser,
+                    )
+                    .with_node_id_prefix(&cached_para.id)
+                    .with_image_resolver(&resolver)
+                    .with_embed_provider(resolved_content);
 
                 if let Some(idx) = entry_index {
                     writer = writer.with_entry_index(idx);
@@ -613,10 +612,8 @@ pub fn render_paragraphs_incremental(
     // Use provided resolver or empty default
     let resolver = image_resolver.cloned().unwrap_or_default();
 
-    // Create a temporary LoroText for the slice (needed by writer)
-    let slice_doc = loro::LoroDoc::new();
-    let slice_text = slice_doc.get_text("content");
-    let _ = slice_text.insert(0, parse_slice);
+    // Create EditorRope for efficient offset conversions
+    let slice_rope = EditorRope::from(parse_slice);
 
     // Determine starting paragraph ID for freshly parsed paragraphs
     // This MUST match the IDs we assign later - the writer bakes node ID prefixes into HTML
@@ -665,9 +662,9 @@ pub fn render_paragraphs_incremental(
     });
 
     // Build writer with all resolvers and auto-incrementing paragraph prefixes
-    let mut writer = EditorWriter::<_, &ResolvedContent, &EditorImageResolver>::new(
+    let mut writer = EditorWriter::<_, _, &ResolvedContent, &EditorImageResolver, ()>::new(
         parse_slice,
-        &slice_text,
+        &slice_rope,
         parser,
     )
     .with_auto_incrementing_prefix(parsed_para_id_start)
diff --git a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__blockquote.snap b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__blockquote.snap
index ecac4e7..eba330c 100644
--- a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__blockquote.snap
+++ b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__blockquote.snap
@@ -8,7 +8,7 @@ expression: result
   char_range:
     - 0
     - 18
-  html: "<blockquote>\n<p id=\"p-0-n0\"><span class=\"md-syntax-block\" data-syn-id=\"s0\" data-char-start=\"0\" data-char-end=\"1\">&gt;</span> This is a quote\n</p>\n"
+  html: "<blockquote><p id=\"p-0-n0\"><span class=\"md-syntax-block\" data-syn-id=\"s0\" data-char-start=\"0\" data-char-end=\"1\">&gt;</span> This is a quote\n</p>"
   offset_map:
     - byte_range:
         - 2
@@ -61,32 +61,13 @@ expression: result
       child_index: ~
       utf16_len: 1
   source_hash: 11268153476336590706
-- byte_range:
-    - 18
-    - 22
-  char_range:
-    - 18
-    - 22
-  html: "<span id=\"gap-20-22\">​</span>"
-  offset_map:
-    - byte_range:
-        - 18
-        - 22
-      char_range:
-        - 18
-        - 22
-      node_id: gap-20-22
-      char_offset_in_node: 0
-      child_index: ~
-      utf16_len: 1
-  source_hash: 6078396554664461735
 - byte_range:
     - 22
     - 41
   char_range:
     - 22
     - 41
-  html: "<span id=\"p-1-n0\" class=\"md-syntax-block\" data-syn-id=\"s1\" data-char-start=\"18\" data-char-end=\"22\">&gt;\n&gt; </span></span>\n<p id=\"p-1-n1\" dir=\"ltr\">With multiple lines</p>\n"
+  html: "<span id=\"p-1-n0\" class=\"md-syntax-block\" data-syn-id=\"s1\" data-char-start=\"18\" data-char-end=\"22\">&gt;\n&gt; </span></span><p id=\"p-1-n1\" dir=\"ltr\">With multiple lines</p>"
   offset_map:
     - byte_range:
         - 18
diff --git a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__bold.snap b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__bold.snap
index 323f2f1..30ae785 100644
--- a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__bold.snap
+++ b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__bold.snap
@@ -8,7 +8,7 @@ expression: result
   char_range:
     - 0
     - 18
-  html: "<p id=\"p-0-n0\" dir=\"ltr\">Some <span class=\"md-syntax-inline\" data-syn-id=\"s0\" data-char-start=\"5\" data-char-end=\"7\">**</span><strong>bold</strong><span class=\"md-syntax-inline\" data-syn-id=\"s1\" data-char-start=\"11\" data-char-end=\"13\">**</span> text</p>\n"
+  html: "<p id=\"p-0-n0\" dir=\"ltr\">Some <span class=\"md-syntax-inline\" data-syn-id=\"s0\" data-char-start=\"5\" data-char-end=\"7\">**</span><strong>bold</strong><span class=\"md-syntax-inline\" data-syn-id=\"s1\" data-char-start=\"11\" data-char-end=\"13\">**</span> text</p>"
   offset_map:
     - byte_range:
         - 0
diff --git a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__bold_italic.snap b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__bold_italic.snap
index 94d4d8d..ec2a55f 100644
--- a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__bold_italic.snap
+++ b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__bold_italic.snap
@@ -8,7 +8,7 @@ expression: result
   char_range:
     - 0
     - 27
-  html: "<p id=\"p-0-n0\" dir=\"ltr\">Some <span class=\"md-syntax-inline\" data-syn-id=\"s0\" data-char-start=\"5\" data-char-end=\"6\">*</span><em><span class=\"md-syntax-inline\" data-syn-id=\"s1\" data-char-start=\"6\" data-char-end=\"8\">**</span><strong>bold italic</strong><span class=\"md-syntax-inline\" data-syn-id=\"s2\" data-char-start=\"19\" data-char-end=\"21\">**</span></em><span class=\"md-syntax-inline\" data-syn-id=\"s3\" data-char-start=\"21\" data-char-end=\"22\">*</span> text</p>\n"
+  html: "<p id=\"p-0-n0\" dir=\"ltr\">Some <span class=\"md-syntax-inline\" data-syn-id=\"s0\" data-char-start=\"5\" data-char-end=\"6\">*</span><em><span class=\"md-syntax-inline\" data-syn-id=\"s1\" data-char-start=\"6\" data-char-end=\"8\">**</span><strong>bold italic</strong><span class=\"md-syntax-inline\" data-syn-id=\"s2\" data-char-start=\"19\" data-char-end=\"21\">**</span></em><span class=\"md-syntax-inline\" data-syn-id=\"s3\" data-char-start=\"21\" data-char-end=\"22\">*</span> text</p>"
   offset_map:
     - byte_range:
         - 0
diff --git a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__code_block_fenced.snap b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__code_block_fenced.snap
index c2495e8..04c6bd1 100644
--- a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__code_block_fenced.snap
+++ b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__code_block_fenced.snap
@@ -8,7 +8,7 @@ expression: result
   char_range:
     - 0
     - 24
-  html: "<span class=\"md-syntax-block\" data-syn-id=\"s0\" data-char-start=\"0\" data-char-end=\"8\" spellcheck=\"false\">```rust</span>\n<pre data-node-id=\"p-0-n0\"><code class=\"wvc-code language-Rust\"><span class=\"wvc-source wvc-rust\"><span class=\"wvc-meta wvc-function wvc-rust\"><span class=\"wvc-meta wvc-function wvc-rust\"><span class=\"wvc-storage wvc-type wvc-function wvc-rust\">fn</span> </span><span class=\"wvc-entity wvc-name wvc-function wvc-rust\">main</span></span><span class=\"wvc-meta wvc-function wvc-rust\"><span class=\"wvc-meta wvc-function wvc-parameters wvc-rust\"><span class=\"wvc-punctuation wvc-section wvc-parameters wvc-begin wvc-rust\">(</span></span><span class=\"wvc-meta wvc-function wvc-rust\"><span class=\"wvc-meta wvc-function wvc-parameters wvc-rust\"><span class=\"wvc-punctuation wvc-section wvc-parameters wvc-end wvc-rust\">)</span></span></span></span><span class=\"wvc-meta wvc-function wvc-rust\"> </span><span class=\"wvc-meta wvc-function wvc-rust\"><span class=\"wvc-meta wvc-block wvc-rust\"><span class=\"wvc-punctuation wvc-section wvc-block wvc-begin wvc-rust\">{</span></span><span class=\"wvc-meta wvc-block wvc-rust\"><span class=\"wvc-punctuation wvc-section wvc-block wvc-end wvc-rust\">}</span></span></span>\n</span></code></pre><span class=\"md-syntax-block\" data-syn-id=\"s1\" data-char-start=\"21\" data-char-end=\"24\" spellcheck=\"false\">```</span>"
+  html: "<span class=\"md-syntax-block\" data-syn-id=\"s0\" data-char-start=\"0\" data-char-end=\"8\" spellcheck=\"false\">```rust</span><pre data-node-id=\"p-0-n0\"><code class=\"wvc-code language-Rust\"><span class=\"wvc-source wvc-rust\"><span class=\"wvc-meta wvc-function wvc-rust\"><span class=\"wvc-meta wvc-function wvc-rust\"><span class=\"wvc-storage wvc-type wvc-function wvc-rust\">fn</span> </span><span class=\"wvc-entity wvc-name wvc-function wvc-rust\">main</span></span><span class=\"wvc-meta wvc-function wvc-rust\"><span class=\"wvc-meta wvc-function wvc-parameters wvc-rust\"><span class=\"wvc-punctuation wvc-section wvc-parameters wvc-begin wvc-rust\">(</span></span><span class=\"wvc-meta wvc-function wvc-rust\"><span class=\"wvc-meta wvc-function wvc-parameters wvc-rust\"><span class=\"wvc-punctuation wvc-section wvc-parameters wvc-end wvc-rust\">)</span></span></span></span><span class=\"wvc-meta wvc-function wvc-rust\"> </span><span class=\"wvc-meta wvc-function wvc-rust\"><span class=\"wvc-meta wvc-block wvc-rust\"><span class=\"wvc-punctuation wvc-section wvc-block wvc-begin wvc-rust\">{</span></span><span class=\"wvc-meta wvc-block wvc-rust\"><span class=\"wvc-punctuation wvc-section wvc-block wvc-end wvc-rust\">}</span></span></span>\n</span></code></pre><span class=\"md-syntax-block\" data-syn-id=\"s1\" data-char-start=\"21\" data-char-end=\"24\" spellcheck=\"false\">```</span>"
   offset_map:
     - byte_range:
         - 8
diff --git a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__gap_between_blocks.snap b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__gap_between_blocks.snap
index 597e5d5..6028e13 100644
--- a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__gap_between_blocks.snap
+++ b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__gap_between_blocks.snap
@@ -8,7 +8,7 @@ expression: result
   char_range:
     - 0
     - 10
-  html: "<h1 data-node-id=\"p-0-n0\" dir=\"ltr\"><span class=\"md-syntax-block\" data-syn-id=\"s0\" data-char-start=\"0\" data-char-end=\"2\"># </span>Heading\n</h1>\n"
+  html: "<h1 data-node-id=\"p-0-n0\" dir=\"ltr\"><span class=\"md-syntax-block\" data-syn-id=\"s0\" data-char-start=\"0\" data-char-end=\"2\"># </span>Heading\n</h1>"
   offset_map:
     - byte_range:
         - 0
@@ -57,7 +57,7 @@ expression: result
   char_range:
     - 11
     - 26
-  html: "<span id=\"p-1-n0\">\n</span>\n<p id=\"p-1-n1\" dir=\"ltr\">Paragraph below</p>\n"
+  html: "<span id=\"p-1-n0\">\n</span><p id=\"p-1-n1\" dir=\"ltr\">Paragraph below</p>"
   offset_map:
     - byte_range:
         - 10
diff --git a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__hard_break.snap b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__hard_break.snap
index 556c922..3846fc0 100644
--- a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__hard_break.snap
+++ b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__hard_break.snap
@@ -8,7 +8,7 @@ expression: result
   char_range:
     - 0
     - 19
-  html: "<p id=\"p-0-n0\" dir=\"ltr\">Line one<span class=\"md-placeholder\" data-syn-id=\"s0\" data-char-start=\"8\" data-char-end=\"10\">  </span><br />​Line two</p>\n"
+  html: "<p id=\"p-0-n0\" dir=\"ltr\">Line one<span class=\"md-placeholder\" data-syn-id=\"s0\" data-char-start=\"8\" data-char-end=\"10\">  </span><br />​Line two</p>"
   offset_map:
     - byte_range:
         - 0
diff --git a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__heading_h1.snap b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__heading_h1.snap
index 14c269c..29e1e89 100644
--- a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__heading_h1.snap
+++ b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__heading_h1.snap
@@ -8,7 +8,7 @@ expression: result
   char_range:
     - 0
     - 11
-  html: "<h1 data-node-id=\"p-0-n0\" dir=\"ltr\"><span class=\"md-syntax-block\" data-syn-id=\"s0\" data-char-start=\"0\" data-char-end=\"2\"># </span>Heading 1</h1>\n"
+  html: "<h1 data-node-id=\"p-0-n0\" dir=\"ltr\"><span class=\"md-syntax-block\" data-syn-id=\"s0\" data-char-start=\"0\" data-char-end=\"2\"># </span>Heading 1</h1>"
   offset_map:
     - byte_range:
         - 0
diff --git a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__heading_levels.snap b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__heading_levels.snap
index 922ba3b..37dc92d 100644
--- a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__heading_levels.snap
+++ b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__heading_levels.snap
@@ -8,7 +8,7 @@ expression: result
   char_range:
     - 0
     - 5
-  html: "<h1 data-node-id=\"p-0-n0\" dir=\"ltr\"><span class=\"md-syntax-block\" data-syn-id=\"s0\" data-char-start=\"0\" data-char-end=\"2\"># </span>H1\n</h1>\n"
+  html: "<h1 data-node-id=\"p-0-n0\" dir=\"ltr\"><span class=\"md-syntax-block\" data-syn-id=\"s0\" data-char-start=\"0\" data-char-end=\"2\"># </span>H1\n</h1>"
   offset_map:
     - byte_range:
         - 0
@@ -57,7 +57,7 @@ expression: result
   char_range:
     - 6
     - 12
-  html: "<span id=\"p-1-n0\">\n</span>\n<h2 data-node-id=\"p-1-n1\" dir=\"ltr\"><span class=\"md-syntax-block\" data-syn-id=\"s1\" data-char-start=\"6\" data-char-end=\"9\">## </span>H2\n</h2>\n"
+  html: "<span id=\"p-1-n0\">\n</span>\n<h2 data-node-id=\"p-1-n1\" dir=\"ltr\"><span class=\"md-syntax-block\" data-syn-id=\"s1\" data-char-start=\"6\" data-char-end=\"9\">## </span>H2\n</h2>"
   offset_map:
     - byte_range:
         - 5
@@ -116,7 +116,7 @@ expression: result
   char_range:
     - 13
     - 20
-  html: "<span id=\"p-2-n0\">\n</span>\n<h3 data-node-id=\"p-2-n1\" dir=\"ltr\"><span class=\"md-syntax-block\" data-syn-id=\"s2\" data-char-start=\"13\" data-char-end=\"17\">### </span>H3\n</h3>\n"
+  html: "<span id=\"p-2-n0\">\n</span>\n<h3 data-node-id=\"p-2-n1\" dir=\"ltr\"><span class=\"md-syntax-block\" data-syn-id=\"s2\" data-char-start=\"13\" data-char-end=\"17\">### </span>H3\n</h3>"
   offset_map:
     - byte_range:
         - 12
@@ -175,7 +175,7 @@ expression: result
   char_range:
     - 21
     - 28
-  html: "<span id=\"p-3-n0\">\n</span>\n<h4 data-node-id=\"p-3-n1\" dir=\"ltr\"><span class=\"md-syntax-block\" data-syn-id=\"s3\" data-char-start=\"21\" data-char-end=\"26\">#### </span>H4</h4>\n"
+  html: "<span id=\"p-3-n0\">\n</span>\n<h4 data-node-id=\"p-3-n1\" dir=\"ltr\"><span class=\"md-syntax-block\" data-syn-id=\"s3\" data-char-start=\"21\" data-char-end=\"26\">#### </span>H4</h4>"
   offset_map:
     - byte_range:
         - 20
diff --git a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__inline_code.snap b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__inline_code.snap
index e719850..88c96ef 100644
--- a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__inline_code.snap
+++ b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__inline_code.snap
@@ -8,7 +8,7 @@ expression: result
   char_range:
     - 0
     - 16
-  html: "<p id=\"p-0-n0\" dir=\"ltr\">Some <span class=\"md-syntax-inline\" data-syn-id=\"s0\" data-char-start=\"5\" data-char-end=\"6\" spellcheck=\"false\">`</span><code>code</code><span class=\"md-syntax-inline\" data-syn-id=\"s1\" data-char-start=\"10\" data-char-end=\"11\" spellcheck=\"false\">`</span> here</p>\n"
+  html: "<p id=\"p-0-n0\" dir=\"ltr\">Some <span class=\"md-syntax-inline\" data-syn-id=\"s0\" data-char-start=\"5\" data-char-end=\"6\" spellcheck=\"false\">`</span><code>code</code><span class=\"md-syntax-inline\" data-syn-id=\"s1\" data-char-start=\"10\" data-char-end=\"11\" spellcheck=\"false\">`</span> here</p>"
   offset_map:
     - byte_range:
         - 0
diff --git a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__italic.snap b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__italic.snap
index 4b3bde2..2a5e45f 100644
--- a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__italic.snap
+++ b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__italic.snap
@@ -8,7 +8,7 @@ expression: result
   char_range:
     - 0
     - 18
-  html: "<p id=\"p-0-n0\" dir=\"ltr\">Some <span class=\"md-syntax-inline\" data-syn-id=\"s0\" data-char-start=\"5\" data-char-end=\"6\">*</span><em>italic</em><span class=\"md-syntax-inline\" data-syn-id=\"s1\" data-char-start=\"12\" data-char-end=\"13\">*</span> text</p>\n"
+  html: "<p id=\"p-0-n0\" dir=\"ltr\">Some <span class=\"md-syntax-inline\" data-syn-id=\"s0\" data-char-start=\"5\" data-char-end=\"6\">*</span><em>italic</em><span class=\"md-syntax-inline\" data-syn-id=\"s1\" data-char-start=\"12\" data-char-end=\"13\">*</span> text</p>"
   offset_map:
     - byte_range:
         - 0
diff --git a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__mixed_unicode_ascii.snap b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__mixed_unicode_ascii.snap
index 3be09e2..827ef5b 100644
--- a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__mixed_unicode_ascii.snap
+++ b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__mixed_unicode_ascii.snap
@@ -8,7 +8,7 @@ expression: result
   char_range:
     - 0
     - 16
-  html: "<p id=\"p-0-n0\" dir=\"ltr\">Hello 你好 world 🎉</p>\n"
+  html: "<p id=\"p-0-n0\" dir=\"ltr\">Hello 你好 world 🎉</p>"
   offset_map:
     - byte_range:
         - 0
diff --git a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__multiple_blank_lines.snap b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__multiple_blank_lines.snap
index 1c8e396..8e4c160 100644
--- a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__multiple_blank_lines.snap
+++ b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__multiple_blank_lines.snap
@@ -8,7 +8,7 @@ expression: result
   char_range:
     - 0
     - 6
-  html: "<p id=\"p-0-n0\" dir=\"ltr\">First\n</p>\n"
+  html: "<p id=\"p-0-n0\" dir=\"ltr\">First\n</p>"
   offset_map:
     - byte_range:
         - 0
@@ -41,32 +41,13 @@ expression: result
       child_index: ~
       utf16_len: 1
   source_hash: 6799294212516041738
-- byte_range:
-    - 6
-    - 9
-  char_range:
-    - 6
-    - 9
-  html: "<span id=\"gap-8-9\">​</span>"
-  offset_map:
-    - byte_range:
-        - 6
-        - 9
-      char_range:
-        - 6
-        - 9
-      node_id: gap-8-9
-      char_offset_in_node: 0
-      child_index: ~
-      utf16_len: 1
-  source_hash: 4789919281594481934
 - byte_range:
     - 9
     - 15
   char_range:
     - 9
     - 15
-  html: "<span id=\"p-1-n0\">\n\n\n</span>\n<p id=\"p-1-n1\" dir=\"ltr\">Second</p>\n"
+  html: "<span id=\"p-1-n0\">\n\n\n</span><p id=\"p-1-n1\" dir=\"ltr\">Second</p>"
   offset_map:
     - byte_range:
         - 6
diff --git a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__multiple_inline_formats.snap b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__multiple_inline_formats.snap
index 2061656..c1bfb65 100644
--- a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__multiple_inline_formats.snap
+++ b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__multiple_inline_formats.snap
@@ -8,7 +8,7 @@ expression: result
   char_range:
     - 0
     - 32
-  html: "<p id=\"p-0-n0\" dir=\"ltr\"><span class=\"md-syntax-inline\" data-syn-id=\"s0\" data-char-start=\"0\" data-char-end=\"2\">**</span><strong>Bold</strong><span class=\"md-syntax-inline\" data-syn-id=\"s1\" data-char-start=\"6\" data-char-end=\"8\">**</span> and <span class=\"md-syntax-inline\" data-syn-id=\"s2\" data-char-start=\"13\" data-char-end=\"14\">*</span><em>italic</em><span class=\"md-syntax-inline\" data-syn-id=\"s3\" data-char-start=\"20\" data-char-end=\"21\">*</span> and <span class=\"md-syntax-inline\" data-syn-id=\"s4\" data-char-start=\"26\" data-char-end=\"27\" spellcheck=\"false\">`</span><code>code</code><span class=\"md-syntax-inline\" data-syn-id=\"s5\" data-char-start=\"31\" data-char-end=\"32\" spellcheck=\"false\">`</span></p>\n"
+  html: "<p id=\"p-0-n0\" dir=\"ltr\"><span class=\"md-syntax-inline\" data-syn-id=\"s0\" data-char-start=\"0\" data-char-end=\"2\">**</span><strong>Bold</strong><span class=\"md-syntax-inline\" data-syn-id=\"s1\" data-char-start=\"6\" data-char-end=\"8\">**</span> and <span class=\"md-syntax-inline\" data-syn-id=\"s2\" data-char-start=\"13\" data-char-end=\"14\">*</span><em>italic</em><span class=\"md-syntax-inline\" data-syn-id=\"s3\" data-char-start=\"20\" data-char-end=\"21\">*</span> and <span class=\"md-syntax-inline\" data-syn-id=\"s4\" data-char-start=\"26\" data-char-end=\"27\" spellcheck=\"false\">`</span><code>code</code><span class=\"md-syntax-inline\" data-syn-id=\"s5\" data-char-start=\"31\" data-char-end=\"32\" spellcheck=\"false\">`</span></p>"
   offset_map:
     - byte_range:
         - 0
diff --git a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__nested_list.snap b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__nested_list.snap
index 45eb510..5b3da23 100644
--- a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__nested_list.snap
+++ b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__nested_list.snap
@@ -2,32 +2,13 @@
 source: crates/weaver-app/src/components/editor/tests.rs
 expression: result
 ---
-- byte_range:
-    - 0
-    - 11
-  char_range:
-    - 0
-    - 11
-  html: "<span id=\"gap-2-11\">​</span>"
-  offset_map:
-    - byte_range:
-        - 0
-        - 11
-      char_range:
-        - 0
-        - 11
-      node_id: gap-2-11
-      char_offset_in_node: 0
-      child_index: ~
-      utf16_len: 1
-  source_hash: 10732713550789592057
 - byte_range:
     - 11
     - 33
   char_range:
     - 11
     - 33
-  html: "<ul>\n<li data-node-id=\"p-0-n0\"><span class=\"md-syntax-block\" data-syn-id=\"s0\" data-char-start=\"0\" data-char-end=\"2\" spellcheck=\"false\">- </span>Parent\n  \n<ul>\n<li data-node-id=\"p-0-n1\"><span class=\"md-syntax-block\" data-syn-id=\"s1\" data-char-start=\"11\" data-char-end=\"13\" spellcheck=\"false\">- </span>Child 1\n</li>\n<span id=\"p-0-n2\">  </span>\n<li data-node-id=\"p-0-n3\"><span class=\"md-syntax-block\" data-syn-id=\"s2\" data-char-start=\"23\" data-char-end=\"25\" spellcheck=\"false\">- </span>Child 2\n</li>\n</ul>\n"
+  html: "<ul><li data-node-id=\"p-0-n0\"><span class=\"md-syntax-block\" data-syn-id=\"s0\" data-char-start=\"0\" data-char-end=\"2\" spellcheck=\"false\">- </span>Parent\n  <ul><li data-node-id=\"p-0-n1\"><span class=\"md-syntax-block\" data-syn-id=\"s1\" data-char-start=\"11\" data-char-end=\"13\" spellcheck=\"false\">- </span>Child 1\n</li><span id=\"p-0-n2\">  </span><li data-node-id=\"p-0-n3\"><span class=\"md-syntax-block\" data-syn-id=\"s2\" data-char-start=\"23\" data-char-end=\"25\" spellcheck=\"false\">- </span>Child 2\n</li></ul>"
   offset_map:
     - byte_range:
         - 0
diff --git a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__only_newlines.snap b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__only_newlines.snap
index b83e67d..be748aa 100644
--- a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__only_newlines.snap
+++ b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__only_newlines.snap
@@ -2,22 +2,4 @@
 source: crates/weaver-app/src/components/editor/tests.rs
 expression: result
 ---
-- byte_range:
-    - 0
-    - 3
-  char_range:
-    - 0
-    - 3
-  html: "<span id=\"gap-0-3\">​</span>"
-  offset_map:
-    - byte_range:
-        - 0
-        - 3
-      char_range:
-        - 0
-        - 3
-      node_id: gap-0-3
-      char_offset_in_node: 0
-      child_index: ~
-      utf16_len: 1
-  source_hash: 0
+[]
diff --git a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__ordered_list.snap b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__ordered_list.snap
index 5c23598..8511299 100644
--- a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__ordered_list.snap
+++ b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__ordered_list.snap
@@ -8,7 +8,7 @@ expression: result
   char_range:
     - 0
     - 27
-  html: "<ol>\n<li data-node-id=\"p-0-n0\"><span class=\"md-syntax-block\" data-syn-id=\"s0\" data-char-start=\"0\" data-char-end=\"3\" spellcheck=\"false\">1. </span>First\n</li>\n<li data-node-id=\"p-0-n1\"><span class=\"md-syntax-block\" data-syn-id=\"s1\" data-char-start=\"9\" data-char-end=\"12\" spellcheck=\"false\">2. </span>Second\n</li>\n<li data-node-id=\"p-0-n2\"><span class=\"md-syntax-block\" data-syn-id=\"s2\" data-char-start=\"19\" data-char-end=\"22\" spellcheck=\"false\">3. </span>Third</li>\n</ol>\n"
+  html: "<ol><li data-node-id=\"p-0-n0\"><span class=\"md-syntax-block\" data-syn-id=\"s0\" data-char-start=\"0\" data-char-end=\"3\" spellcheck=\"false\">1. </span>First\n</li><li data-node-id=\"p-0-n1\"><span class=\"md-syntax-block\" data-syn-id=\"s1\" data-char-start=\"9\" data-char-end=\"12\" spellcheck=\"false\">2. </span>Second\n</li><li data-node-id=\"p-0-n2\"><span class=\"md-syntax-block\" data-syn-id=\"s2\" data-char-start=\"19\" data-char-end=\"22\" spellcheck=\"false\">3. </span>Third</li></ol>"
   offset_map:
     - byte_range:
         - 0
diff --git a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__single_paragraph.snap b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__single_paragraph.snap
index 354b3c3..914afb6 100644
--- a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__single_paragraph.snap
+++ b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__single_paragraph.snap
@@ -8,7 +8,7 @@ expression: result
   char_range:
     - 0
     - 11
-  html: "<p id=\"p-0-n0\" dir=\"ltr\">Hello world</p>\n"
+  html: "<p id=\"p-0-n0\" dir=\"ltr\">Hello world</p>"
   offset_map:
     - byte_range:
         - 0
diff --git a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__three_paragraphs.snap b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__three_paragraphs.snap
index e94240b..08b70c0 100644
--- a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__three_paragraphs.snap
+++ b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__three_paragraphs.snap
@@ -8,7 +8,7 @@ expression: result
   char_range:
     - 0
     - 5
-  html: "<p id=\"p-0-n0\" dir=\"ltr\">One.\n</p>\n"
+  html: "<p id=\"p-0-n0\" dir=\"ltr\">One.\n</p>"
   offset_map:
     - byte_range:
         - 0
@@ -47,7 +47,7 @@ expression: result
   char_range:
     - 6
     - 11
-  html: "<span id=\"p-1-n0\">\n</span>\n<p id=\"p-1-n1\" dir=\"ltr\">Two.\n</p>\n"
+  html: "<span id=\"p-1-n0\">\n</span><p id=\"p-1-n1\" dir=\"ltr\">Two.\n</p>"
   offset_map:
     - byte_range:
         - 5
@@ -96,7 +96,7 @@ expression: result
   char_range:
     - 12
     - 18
-  html: "<span id=\"p-2-n0\">\n</span>\n<p id=\"p-2-n1\" dir=\"ltr\">Three.</p>\n"
+  html: "<span id=\"p-2-n0\">\n</span><p id=\"p-2-n1\" dir=\"ltr\">Three.</p>"
   offset_map:
     - byte_range:
         - 11
diff --git a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__trailing_double_newline.snap b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__trailing_double_newline.snap
index 015dc06..6b999f4 100644
--- a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__trailing_double_newline.snap
+++ b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__trailing_double_newline.snap
@@ -8,7 +8,7 @@ expression: result
   char_range:
     - 0
     - 6
-  html: "<p id=\"p-0-n0\" dir=\"ltr\">Hello\n</p>\n"
+  html: "<p id=\"p-0-n0\" dir=\"ltr\">Hello\n</p>"
   offset_map:
     - byte_range:
         - 0
@@ -41,22 +41,3 @@ expression: result
       child_index: ~
       utf16_len: 1
   source_hash: 1280328235052234789
-- byte_range:
-    - 6
-    - 7
-  char_range:
-    - 6
-    - 7
-  html: "<span id=\"gap-6-7\">​</span>"
-  offset_map:
-    - byte_range:
-        - 6
-        - 7
-      char_range:
-        - 6
-        - 7
-      node_id: gap-6-7
-      char_offset_in_node: 0
-      child_index: ~
-      utf16_len: 1
-  source_hash: 0
diff --git a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__trailing_single_newline.snap b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__trailing_single_newline.snap
index 7e2c852..6b999f4 100644
--- a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__trailing_single_newline.snap
+++ b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__trailing_single_newline.snap
@@ -8,7 +8,7 @@ expression: result
   char_range:
     - 0
     - 6
-  html: "<p id=\"p-0-n0\" dir=\"ltr\">Hello\n</p>\n"
+  html: "<p id=\"p-0-n0\" dir=\"ltr\">Hello\n</p>"
   offset_map:
     - byte_range:
         - 0
diff --git a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__two_paragraphs.snap b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__two_paragraphs.snap
index a63f165..8c38833 100644
--- a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__two_paragraphs.snap
+++ b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__two_paragraphs.snap
@@ -8,7 +8,7 @@ expression: result
   char_range:
     - 0
     - 17
-  html: "<p id=\"p-0-n0\" dir=\"ltr\">First paragraph.\n</p>\n"
+  html: "<p id=\"p-0-n0\" dir=\"ltr\">First paragraph.\n</p>"
   offset_map:
     - byte_range:
         - 0
@@ -47,7 +47,7 @@ expression: result
   char_range:
     - 18
     - 35
-  html: "<span id=\"p-1-n0\">\n</span>\n<p id=\"p-1-n1\" dir=\"ltr\">Second paragraph.</p>\n"
+  html: "<span id=\"p-1-n0\">\n</span><p id=\"p-1-n1\" dir=\"ltr\">Second paragraph.</p>"
   offset_map:
     - byte_range:
         - 17
diff --git a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__unicode_cjk.snap b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__unicode_cjk.snap
index 3be4818..95b96b4 100644
--- a/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__unicode_cjk.snap
+++ b/crates/weaver-app/src/components/editor/snapshots/weaver_app__components__editor__tests__unicode_cjk.snap
@@ -8,7 +8,7 @@ expression: result
   char_range:
     - 0
     - 4
-  html: "<p id=\"p-0-n0\" dir=\"ltr\">你好世界</p>\n"
+  html: "<p id=\"p-0-n0\" dir=\"ltr\">你好世界</p>"
   offset_map:
     - byte_range:
         - 0
diff --git a/crates/weaver-app/src/components/editor/tests.rs b/crates/weaver-app/src/components/editor/tests.rs
index 3b51496..081735a 100644
--- a/crates/weaver-app/src/components/editor/tests.rs
+++ b/crates/weaver-app/src/components/editor/tests.rs
@@ -1,6 +1,6 @@
 //! Snapshot tests for the markdown editor rendering pipeline.
 
-use super::offset_map::{OffsetMapping, find_mapping_for_char};
+use weaver_editor_core::{OffsetMapping, find_mapping_for_char};
 use super::paragraph::ParagraphRender;
 use super::render::render_paragraphs_incremental;
 use loro::LoroDoc;
@@ -45,7 +45,7 @@ impl From<&OffsetMapping> for TestOffsetMapping {
         TestOffsetMapping {
             byte_range: (m.byte_range.start, m.byte_range.end),
             char_range: (m.char_range.start, m.char_range.end),
-            node_id: m.node_id.clone(),
+            node_id: m.node_id.to_string(),
             char_offset_in_node: m.char_offset_in_node,
             child_index: m.child_index,
             utf16_len: m.utf16_len,
@@ -246,7 +246,7 @@ fn test_find_mapping_exact_start() {
     let mappings = vec![OffsetMapping {
         byte_range: 0..5,
         char_range: 0..5,
-        node_id: "n0".to_string(),
+        node_id: "n0".into(),
         char_offset_in_node: 0,
         child_index: None,
         utf16_len: 5,
@@ -264,7 +264,7 @@ fn test_find_mapping_exact_end_inclusive() {
     let mappings = vec![OffsetMapping {
         byte_range: 0..5,
         char_range: 0..5,
-        node_id: "n0".to_string(),
+        node_id: "n0".into(),
         char_offset_in_node: 0,
         child_index: None,
         utf16_len: 5,
@@ -280,7 +280,7 @@ fn test_find_mapping_middle() {
     let mappings = vec![OffsetMapping {
         byte_range: 0..10,
         char_range: 0..10,
-        node_id: "n0".to_string(),
+        node_id: "n0".into(),
         char_offset_in_node: 0,
         child_index: None,
         utf16_len: 10,
@@ -295,7 +295,7 @@ fn test_find_mapping_before_first() {
     let mappings = vec![OffsetMapping {
         byte_range: 5..10,
         char_range: 5..10,
-        node_id: "n0".to_string(),
+        node_id: "n0".into(),
         char_offset_in_node: 0,
         child_index: None,
         utf16_len: 5,
@@ -311,7 +311,7 @@ fn test_find_mapping_after_last() {
     let mappings = vec![OffsetMapping {
         byte_range: 0..5,
         char_range: 0..5,
-        node_id: "n0".to_string(),
+        node_id: "n0".into(),
         char_offset_in_node: 0,
         child_index: None,
         utf16_len: 5,
@@ -335,7 +335,7 @@ fn test_find_mapping_invisible_snaps() {
     let mappings = vec![OffsetMapping {
         byte_range: 0..2,
         char_range: 0..2,
-        node_id: "n0".to_string(),
+        node_id: "n0".into(),
         char_offset_in_node: 0,
         child_index: None,
         utf16_len: 0, // invisible
@@ -726,7 +726,7 @@ fn test_blockquote_needs_space_or_newline() {
       char_range:
         - 0
         - 6
-      html: "<blockquote>\n<p id=\"p-0-n0\"><span class=\"md-syntax-block\" data-syn-id=\"s0\" data-char-start=\"0\" data-char-end=\"1\">&gt;</span>quote</p>\n"
+      html: "<blockquote><p id=\"p-0-n0\"><span class=\"md-syntax-block\" data-syn-id=\"s0\" data-char-start=\"0\" data-char-end=\"1\">&gt;</span>quote</p>"
       offset_map:
         - byte_range:
             - 1
diff --git a/crates/weaver-app/src/components/editor/visibility.rs b/crates/weaver-app/src/components/editor/visibility.rs
index 1b13f40..b9c801b 100644
--- a/crates/weaver-app/src/components/editor/visibility.rs
+++ b/crates/weaver-app/src/components/editor/visibility.rs
@@ -3,6 +3,8 @@
 //! Implements Obsidian-style formatting character visibility: syntax markers
 //! are hidden when cursor is not near them, revealed when cursor approaches.
 
+use weaver_editor_core::SmolStr;
+
 use super::document::Selection;
 use super::paragraph::ParagraphRender;
 use super::writer::{SyntaxSpanInfo, SyntaxType};
@@ -13,7 +15,7 @@ use std::ops::Range;
 #[derive(Debug, Clone, Default)]
 pub struct VisibilityState {
     /// Set of syn_ids that should be visible
-    pub visible_span_ids: HashSet<String>,
+    pub visible_span_ids: HashSet<SmolStr>,
 }
 
 impl VisibilityState {
@@ -253,7 +255,7 @@ mod tests {
         syntax_type: SyntaxType,
     ) -> SyntaxSpanInfo {
         SyntaxSpanInfo {
-            syn_id: syn_id.to_string(),
+            syn_id: syn_id.into(),
             char_range: start..end,
             syntax_type,
             formatted_range: None,
@@ -268,7 +270,7 @@ mod tests {
         formatted_range: Range<usize>,
     ) -> SyntaxSpanInfo {
         SyntaxSpanInfo {
-            syn_id: syn_id.to_string(),
+            syn_id: syn_id.into(),
             char_range: start..end,
             syntax_type,
             formatted_range: Some(formatted_range),
diff --git a/crates/weaver-app/src/components/editor/writer.rs b/crates/weaver-app/src/components/editor/writer.rs
index 3d2f5de..fe8e74f 100644
--- a/crates/weaver-app/src/components/editor/writer.rs
+++ b/crates/weaver-app/src/components/editor/writer.rs
@@ -1,1325 +1,16 @@
-//! HTML writer for markdown editor with visible formatting characters.
+//! HTML writer for markdown editor - re-exports from weaver-editor-core.
 //!
-//! Based on ClientWriter from weaver-renderer, but modified to preserve
-//! formatting characters (**, *, #, etc) wrapped in styled spans.
-//!
-//! Uses Parser::into_offset_iter() to track gaps between events, which
-//! represent consumed formatting characters.
-pub mod embed;
-pub mod segmented;
-pub mod syntax;
-pub mod tags;
-
-use super::offset_map::OffsetMapping;
-use crate::components::editor::writer::segmented::SegmentedWriter;
-pub use embed::{EditorImageResolver, EmbedContentProvider, ImageResolver};
-use loro::LoroText;
-use markdown_weaver::{Alignment, CowStr, Event, WeaverAttributes};
-use markdown_weaver_escape::{StrWrite, escape_html, escape_html_body_text_with_char_count};
-use std::collections::HashMap;
-use std::fmt;
-use std::ops::Range;
-pub use syntax::{SyntaxSpanInfo, SyntaxType};
-use weaver_common::EntryIndex;
-
-/// Result of rendering with the EditorWriter.
-#[derive(Debug, Clone)]
-pub struct WriterResult {
-    /// HTML segments, one per paragraph (parallel to paragraph_ranges)
-    pub html_segments: Vec<String>,
-
-    /// Offset mappings from source to DOM positions, grouped by paragraph
-    /// Each inner Vec corresponds to a paragraph in html_segments
-    pub offset_maps_by_paragraph: Vec<Vec<OffsetMapping>>,
-
-    /// Paragraph boundaries in source: (byte_range, char_range)
-    /// These are extracted during rendering by tracking Tag::Paragraph events
-    pub paragraph_ranges: Vec<(Range<usize>, Range<usize>)>,
-
-    /// Syntax spans that can be conditionally hidden, grouped by paragraph
-    pub syntax_spans_by_paragraph: Vec<Vec<SyntaxSpanInfo>>,
-
-    /// Refs (wikilinks, AT embeds) collected during this render pass, grouped by paragraph
-    pub collected_refs_by_paragraph: Vec<Vec<weaver_common::ExtractedRef>>,
-}
-
-/// Tracks the type of wrapper element emitted for WeaverBlock prefix
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-enum WrapperElement {
-    Aside,
-    Div,
-}
-
-#[derive(Debug, Clone, Copy)]
-pub enum TableState {
-    Head,
-    Body,
-}
-
-/// HTML writer that preserves markdown formatting characters.
-///
-/// This writer processes offset-iter events to detect gaps (consumed formatting)
-/// and emits them as styled spans for visibility in the editor.
-///
-/// Output is segmented by paragraph boundaries - each paragraph's HTML goes into
-/// a separate String in the output segments Vec.
-pub struct EditorWriter<'a, I: Iterator<Item = (Event<'a>, Range<usize>)>, E = (), R = ()> {
-    source: &'a str,
-    source_text: &'a LoroText,
-    events: I,
-    writer: SegmentedWriter,
-    last_byte_offset: usize,
-    last_char_offset: usize,
-
-    end_newline: bool,
-    in_non_writing_block: bool,
-
-    table_state: TableState,
-    table_alignments: Vec<Alignment>,
-    table_cell_index: usize,
-
-    numbers: HashMap<String, usize>,
-
-    embed_provider: Option<E>,
-    image_resolver: Option<R>,
-    entry_index: Option<&'a EntryIndex>,
-
-    code_buffer: Option<(Option<String>, String)>, // (lang, content)
-    code_buffer_byte_range: Option<Range<usize>>,  // byte range of buffered code content
-    code_buffer_char_range: Option<Range<usize>>,  // char range of buffered code content
-    code_block_char_start: Option<usize>,          // char offset where code block started
-    code_block_opening_span_idx: Option<usize>,    // index of opening fence syntax span
-    pending_blockquote_range: Option<Range<usize>>, // range for emitting > inside next paragraph
-
-    // Table rendering mode
-    render_tables_as_markdown: bool,
-    table_start_offset: Option<usize>, // track start of table for markdown rendering
-
-    // Offset mapping tracking - current paragraph
-    offset_maps: Vec<OffsetMapping>,
-    node_id_prefix: Option<String>, // paragraph ID prefix for stable node IDs
-    auto_increment_prefix: Option<usize>, // if set, auto-increment prefix per paragraph from this value
-    static_prefix_override: Option<(usize, String)>, // (index, prefix) - override auto-increment at this index
-    current_paragraph_index: usize, // which paragraph we're currently building (0-indexed)
-    next_node_id: usize,
-    current_node_id: Option<String>, // node ID for current text container
-    current_node_char_offset: usize, // UTF-16 offset within current node
-    current_node_child_count: usize, // number of child elements/text nodes in current container
-
-    // Incremental UTF-16 offset tracking (replaces rope.chars_to_wchars)
-    // Maps char_offset -> utf16_offset at checkpoints we've traversed.
-    // Can be reused for future lookups or passed to subsequent writers.
-    utf16_checkpoints: Vec<(usize, usize)>, // (char_offset, utf16_offset)
-
-    // Paragraph boundary tracking for incremental rendering
-    paragraph_ranges: Vec<(Range<usize>, Range<usize>)>, // (byte_range, char_range)
-    current_paragraph_start: Option<(usize, usize)>,     // (byte_offset, char_offset)
-    list_depth: usize, // Track nesting depth to avoid paragraph boundary override inside lists
-    in_footnote_def: bool, // Suppress inner paragraph boundaries in footnote definitions
-
-    // Syntax span tracking for conditional visibility - current paragraph
-    syntax_spans: Vec<SyntaxSpanInfo>,
-    next_syn_id: usize,
-    /// Stack of pending inline formats: (syn_id of opening span, char start of region)
-    /// Used to set formatted_range when closing paired inline markers
-    pending_inline_formats: Vec<(String, usize)>,
-
-    /// Collected refs (wikilinks, AT embeds, AT links) for current paragraph
-    ref_collector: weaver_common::RefCollector,
-
-    // Per-paragraph accumulated results (completed paragraphs)
-    offset_maps_by_para: Vec<Vec<OffsetMapping>>,
-    syntax_spans_by_para: Vec<Vec<SyntaxSpanInfo>>,
-    refs_by_para: Vec<Vec<weaver_common::ExtractedRef>>,
-
-    // WeaverBlock prefix system
-    /// Pending WeaverBlock attrs to apply to the next block element
-    pending_block_attrs: Option<WeaverAttributes<'static>>,
-    /// Type of wrapper element currently open (needs closing on block end)
-    active_wrapper: Option<WrapperElement>,
-    /// Buffer for WeaverBlock text content (to parse for attrs)
-    weaver_block_buffer: String,
-    /// Start char offset of current WeaverBlock (for syntax span)
-    weaver_block_char_start: Option<usize>,
-
-    // Footnote syntax linking (ref ↔ definition visibility)
-    /// Maps footnote name → (syntax_span_index, char_start) for linking ref and def
-    footnote_ref_spans: HashMap<String, (usize, usize)>,
-    /// Current footnote definition being processed (name, syntax_span_index, char_start)
-    current_footnote_def: Option<(String, usize, usize)>,
-
-    _phantom: std::marker::PhantomData<&'a ()>,
-}
-
-impl<'a, I: Iterator<Item = (Event<'a>, Range<usize>)>, E: EmbedContentProvider, R: ImageResolver>
-    EditorWriter<'a, I, E, R>
-{
-    pub fn new(source: &'a str, source_text: &'a LoroText, events: I) -> Self {
-        Self::new_with_all_offsets(source, source_text, events, 0, 0, 0, 0)
-    }
-
-    /// Get the next paragraph ID that would be assigned (for tracking allocations).
-    #[allow(dead_code)]
-    pub fn next_paragraph_id(&self) -> Option<usize> {
-        self.auto_increment_prefix
-    }
-
-    /// Override the auto-incrementing prefix for a specific paragraph index.
-    /// Use this when you need a specific paragraph (e.g., cursor paragraph) to have
-    /// a stable prefix for DOM/offset_map compatibility.
-    pub fn with_static_prefix_at_index(mut self, index: usize, prefix: &str) -> Self {
-        self.static_prefix_override = Some((index, prefix.to_string()));
-        // If this is for paragraph 0, apply it immediately
-        if index == 0 {
-            self.node_id_prefix = Some(prefix.to_string());
-            self.next_node_id = 0;
-        }
-        self
-    }
-
-    /// Finalize the current paragraph: move accumulated items to per-para vectors,
-    /// start a new output segment for the next paragraph.
-    fn finalize_paragraph(&mut self, byte_range: Range<usize>, char_range: Range<usize>) {
-        // Record paragraph boundary
-        self.paragraph_ranges.push((byte_range, char_range));
-
-        // Move current paragraph's data to per-para vectors
-        self.offset_maps_by_para
-            .push(std::mem::take(&mut self.offset_maps));
-        self.syntax_spans_by_para
-            .push(std::mem::take(&mut self.syntax_spans));
-        self.refs_by_para
-            .push(std::mem::take(&mut self.ref_collector.refs));
-
-        // Advance to next paragraph
-        self.current_paragraph_index += 1;
-
-        // Determine prefix for next paragraph
-        if let Some((override_idx, ref override_prefix)) = self.static_prefix_override {
-            if self.current_paragraph_index == override_idx {
-                // Use the static override for this paragraph
-                self.node_id_prefix = Some(override_prefix.clone());
-                self.next_node_id = 0;
-            } else if let Some(ref mut current_id) = self.auto_increment_prefix {
-                // Use auto-increment (skip the override index to avoid collision)
-                *current_id += 1;
-                self.node_id_prefix = Some(format!("p-{}", *current_id));
-                self.next_node_id = 0;
-            }
-        } else if let Some(ref mut current_id) = self.auto_increment_prefix {
-            // Normal auto-increment
-            *current_id += 1;
-            self.node_id_prefix = Some(format!("p-{}", *current_id));
-            self.next_node_id = 0;
-        }
-
-        // Start new output segment for next paragraph
-        self.writer.new_segment();
-    }
-
-    #[inline]
-    fn write_newline(&mut self) -> fmt::Result {
-        self.end_newline = true;
-        self.writer.write_str("\n")
-    }
-
-    #[inline]
-    fn write(&mut self, s: &str) -> fmt::Result {
-        if !s.is_empty() {
-            self.end_newline = s.ends_with('\n');
-        }
-        self.writer.write_str(s)
-    }
-
-    /// Generate a unique syntax span ID
-    fn gen_syn_id(&mut self) -> String {
-        let id = format!("s{}", self.next_syn_id);
-        self.next_syn_id += 1;
-        id
-    }
-
-    /// Finalize a paired inline format (Strong, Emphasis, Strikethrough).
-    /// Pops the pending format info and sets formatted_range on both opening and closing spans.
-    fn finalize_paired_inline_format(&mut self) {
-        if let Some((opening_syn_id, format_start)) = self.pending_inline_formats.pop() {
-            let format_end = self.last_char_offset;
-            let formatted_range = format_start..format_end;
-
-            // Update the opening span's formatted_range
-            if let Some(opening_span) = self
-                .syntax_spans
-                .iter_mut()
-                .find(|s| s.syn_id == opening_syn_id)
-            {
-                opening_span.formatted_range = Some(formatted_range.clone());
-            } else {
-                tracing::warn!(
-                    "[FINALIZE_PAIRED] Could not find opening span {}",
-                    opening_syn_id
-                );
-            }
-
-            // Update the closing span's formatted_range (the most recent one)
-            // The closing syntax was just emitted by emit_gap_before, so it's the last span
-            if let Some(closing_span) = self.syntax_spans.last_mut() {
-                // Only update if it's an inline span (closing syntax should be inline)
-                if closing_span.syntax_type == SyntaxType::Inline {
-                    closing_span.formatted_range = Some(formatted_range);
-                }
-            }
-        }
-    }
-
-    /// Generate a unique node ID.
-    /// If a prefix is set (paragraph ID), produces `{prefix}-n{counter}`.
-    /// Otherwise produces `n{counter}` for backwards compatibility.
-    fn gen_node_id(&mut self) -> String {
-        let id = if let Some(ref prefix) = self.node_id_prefix {
-            format!("{}-n{}", prefix, self.next_node_id)
-        } else {
-            format!("n{}", self.next_node_id)
-        };
-        self.next_node_id += 1;
-        id
-    }
-
-    /// Start tracking a new text container node
-    fn begin_node(&mut self, node_id: String) {
-        self.current_node_id = Some(node_id);
-        self.current_node_char_offset = 0;
-        self.current_node_child_count = 0;
-    }
-
-    /// Stop tracking current node
-    fn end_node(&mut self) {
-        self.current_node_id = None;
-        self.current_node_char_offset = 0;
-        self.current_node_child_count = 0;
-    }
-
-    /// Compute UTF-16 length for a text slice with fast path for ASCII.
-    #[inline]
-    fn utf16_len_for_slice(text: &str) -> usize {
-        let byte_len = text.len();
-        let char_len = text.chars().count();
-
-        // Fast path: if byte_len == char_len, all ASCII, so utf16_len == char_len
-        if byte_len == char_len {
-            char_len
-        } else {
-            // Slow path: has multi-byte chars, need to count UTF-16 code units
-            text.encode_utf16().count()
-        }
-    }
-
-    /// Record an offset mapping for the given byte and char ranges.
-    ///
-    /// Builds up utf16_checkpoints incrementally for efficient lookups.
-    fn record_mapping(&mut self, byte_range: Range<usize>, char_range: Range<usize>) {
-        if let Some(ref node_id) = self.current_node_id {
-            // Get UTF-16 length using fast path
-            let text_slice = &self.source[byte_range.clone()];
-            let utf16_len = Self::utf16_len_for_slice(text_slice);
-
-            // Record checkpoint at end of this range for future lookups
-            let last_checkpoint = self.utf16_checkpoints.last().copied().unwrap_or((0, 0));
-            let new_utf16_offset = last_checkpoint.1 + utf16_len;
-
-            // Only add checkpoint if we've advanced
-            if char_range.end > last_checkpoint.0 {
-                self.utf16_checkpoints
-                    .push((char_range.end, new_utf16_offset));
-            }
-
-            let mapping = OffsetMapping {
-                byte_range: byte_range.clone(),
-                char_range: char_range.clone(),
-                node_id: node_id.clone(),
-                char_offset_in_node: self.current_node_char_offset,
-                child_index: None, // text-based position
-                utf16_len,
-            };
-            self.offset_maps.push(mapping);
-            self.current_node_char_offset += utf16_len;
-        } else {
-            tracing::debug!("[RECORD_MAPPING] SKIPPED - current_node_id is None!");
-        }
-    }
-
-    /// Process markdown events and write HTML.
-    ///
-    /// Returns offset mappings and paragraph boundaries. The HTML is written
-    /// to the writer passed in the constructor.
-    pub fn run(mut self) -> Result<WriterResult, fmt::Error> {
-        while let Some((event, range)) = self.events.next() {
-            tracing::trace!(
-                target: "weaver::writer",
-                event = ?event,
-                byte_range = ?range,
-                "processing event"
-            );
-
-            // For End events, emit any trailing content within the event's range
-            // BEFORE calling end_tag (which calls end_node and clears current_node_id)
-            //
-            // EXCEPTION: For inline formatting tags (Strong, Emphasis, Strikethrough),
-            // the closing syntax must be emitted AFTER the closing HTML tag, not before.
-            // Otherwise the closing `**` span ends up INSIDE the <strong> element.
-            // These tags handle their own closing syntax in end_tag().
-            // Image and Embed handle ALL their syntax in the Start event, so exclude them too.
-            use markdown_weaver::TagEnd;
-            let is_self_handled_end = matches!(
-                &event,
-                Event::End(
-                    TagEnd::Strong
-                        | TagEnd::Emphasis
-                        | TagEnd::Strikethrough
-                        | TagEnd::Image
-                        | TagEnd::Embed
-                )
-            );
-
-            if matches!(&event, Event::End(_)) && !is_self_handled_end {
-                // Emit gap from last_byte_offset to range.end
-                self.emit_gap_before(range.end)?;
-            } else if !matches!(&event, Event::End(_)) {
-                // For other events, emit any gap before range.start
-                // (emit_syntax handles char offset tracking)
-                self.emit_gap_before(range.start)?;
-            }
-            // For inline format End events, gap is emitted inside end_tag() AFTER the closing HTML
-
-            // Store last_byte before processing
-            let last_byte_before = self.last_byte_offset;
-
-            // Process the event (passing range for tag syntax)
-            self.process_event(event, range.clone())?;
-
-            // Update tracking - but don't override if start_tag manually updated it
-            // (for inline formatting tags that emit opening syntax)
-            if self.last_byte_offset == last_byte_before {
-                // Event didn't update offset, so we update it
-                self.last_byte_offset = range.end;
-            }
-            // else: Event updated offset (e.g. start_tag emitted opening syntax), keep that value
-        }
-
-        // Emit any trailing syntax
-        self.emit_gap_before(self.source.len())?;
-
-        // Handle unmapped trailing content (stripped by parser)
-        // This includes trailing spaces that markdown ignores
-        let doc_byte_len = self.source.len();
-        let doc_char_len = self.source_text.len_unicode();
-
-        if self.last_byte_offset < doc_byte_len || self.last_char_offset < doc_char_len {
-            // Emit the trailing content as visible syntax
-            if self.last_byte_offset < doc_byte_len {
-                let trailing = &self.source[self.last_byte_offset..];
-                if !trailing.is_empty() {
-                    let char_start = self.last_char_offset;
-                    let trailing_char_len = trailing.chars().count();
-
-                    let char_end = char_start + trailing_char_len;
-                    let syn_id = self.gen_syn_id();
-
-                    write!(
-                        &mut self.writer,
-                        "<span class=\"md-placeholder\" data-syn-id=\"{}\" data-char-start=\"{}\" data-char-end=\"{}\">",
-                        syn_id, char_start, char_end
-                    )?;
-                    escape_html(&mut self.writer, trailing)?;
-                    self.write("</span>")?;
-
-                    // Record syntax span info
-                    // self.syntax_spans.push(SyntaxSpanInfo {
-                    //     syn_id,
-                    //     char_range: char_start..char_end,
-                    //     syntax_type: SyntaxType::Inline,
-                    //     formatted_range: None,
-                    // });
-
-                    // Record mapping if we have a node
-                    if let Some(ref node_id) = self.current_node_id {
-                        let mapping = OffsetMapping {
-                            byte_range: self.last_byte_offset..doc_byte_len,
-                            char_range: char_start..char_end,
-                            node_id: node_id.clone(),
-                            char_offset_in_node: self.current_node_char_offset,
-                            child_index: None,
-                            utf16_len: trailing_char_len, // visible
-                        };
-                        self.offset_maps.push(mapping);
-                        self.current_node_char_offset += trailing_char_len;
-                    }
-
-                    self.last_char_offset = char_start + trailing_char_len;
-                }
-            }
-        }
-
-        // Add any remaining accumulated data for the last paragraph
-        // (content that wasn't followed by a paragraph boundary)
-        if !self.offset_maps.is_empty()
-            || !self.syntax_spans.is_empty()
-            || !self.ref_collector.refs.is_empty()
-        {
-            self.offset_maps_by_para.push(self.offset_maps);
-            self.syntax_spans_by_para.push(self.syntax_spans);
-            self.refs_by_para.push(self.ref_collector.refs);
-        }
-
-        // Get HTML segments from writer
-        let html_segments = self.writer.into_segments();
-
-        Ok(WriterResult {
-            html_segments,
-            offset_maps_by_paragraph: self.offset_maps_by_para,
-            paragraph_ranges: self.paragraph_ranges,
-            syntax_spans_by_paragraph: self.syntax_spans_by_para,
-            collected_refs_by_paragraph: self.refs_by_para,
-        })
-    }
-
-    // Consume raw text events until end tag, for alt attributes
-    #[allow(dead_code)]
-    fn raw_text(&mut self) -> Result<(), fmt::Error> {
-        use Event::*;
-        let mut nest = 0;
-        while let Some((event, _range)) = self.events.next() {
-            match event {
-                Start(_) => nest += 1,
-                End(_) => {
-                    if nest == 0 {
-                        break;
-                    }
-                    nest -= 1;
-                }
-                Html(_) => {}
-                InlineHtml(text) | Code(text) | Text(text) => {
-                    // Don't use escape_html_body_text here.
-                    // The output of this function is used in the `alt` attribute.
-                    escape_html(&mut self.writer, &text)?;
-                    self.end_newline = text.ends_with('\n');
-                }
-                InlineMath(text) => {
-                    self.write("$")?;
-                    escape_html(&mut self.writer, &text)?;
-                    self.write("$")?;
-                }
-                DisplayMath(text) => {
-                    self.write("$$")?;
-                    escape_html(&mut self.writer, &text)?;
-                    self.write("$$")?;
-                }
-                SoftBreak | HardBreak | Rule => {
-                    self.write(" ")?;
-                }
-                FootnoteReference(name) => {
-                    let len = self.numbers.len() + 1;
-                    let number = *self.numbers.entry(name.into_string()).or_insert(len);
-                    write!(&mut self.writer, "[{}]", number)?;
-                }
-                TaskListMarker(true) => self.write("[x]")?,
-                TaskListMarker(false) => self.write("[ ]")?,
-                WeaverBlock(_) => {}
-            }
-        }
-        Ok(())
-    }
-
-    /// Consume events until End tag without writing anything.
-    /// Used when we've already extracted content from source and just need to advance the iterator.
-    fn consume_until_end(&mut self) {
-        use Event::*;
-        let mut nest = 0;
-        while let Some((event, _range)) = self.events.next() {
-            match event {
-                Start(_) => nest += 1,
-                End(_) => {
-                    if nest == 0 {
-                        break;
-                    }
-                    nest -= 1;
-                }
-                _ => {}
-            }
-        }
-    }
-
-    /// Parse WeaverBlock text content into attributes.
-    /// Format: comma-separated, colon for key:value, otherwise class.
-    /// Example: ".aside, width: 300px" -> classes: ["aside"], attrs: [("width", "300px")]
-    fn parse_weaver_attrs(text: &str) -> WeaverAttributes<'static> {
-        let mut classes = Vec::new();
-        let mut attrs = Vec::new();
-
-        for part in text.split(',') {
-            let part = part.trim();
-            if part.is_empty() {
-                continue;
-            }
+//! The core EditorWriter lives in weaver-editor-core. This module provides:
+//! - Re-exports of core types for convenience
+//! - App-specific EditorImageResolver for image URL resolution
 
-            if let Some((key, value)) = part.split_once(':') {
-                let key = key.trim();
-                let value = value.trim();
-                if !key.is_empty() && !value.is_empty() {
-                    attrs.push((
-                        CowStr::from(key.to_string()),
-                        CowStr::from(value.to_string()),
-                    ));
-                }
-            } else {
-                // No colon - treat as class, strip leading dot if present
-                let class = part.strip_prefix('.').unwrap_or(part);
-                if !class.is_empty() {
-                    classes.push(CowStr::from(class.to_string()));
-                }
-            }
-        }
-
-        WeaverAttributes { classes, attrs }
-    }
-
-    /// Emit wrapper element start based on pending block attrs.
-    /// Returns true if a wrapper was emitted.
-    fn emit_wrapper_start(&mut self) -> Result<bool, fmt::Error> {
-        if let Some(attrs) = self.pending_block_attrs.take() {
-            let is_aside = attrs.classes.iter().any(|c| c.as_ref() == "aside");
-
-            if is_aside {
-                self.write("<aside")?;
-                self.active_wrapper = Some(WrapperElement::Aside);
-            } else {
-                self.write("<div")?;
-                self.active_wrapper = Some(WrapperElement::Div);
-            }
-
-            // Write classes (excluding "aside" if using <aside> element)
-            let classes: Vec<_> = if is_aside {
-                attrs
-                    .classes
-                    .iter()
-                    .filter(|c| c.as_ref() != "aside")
-                    .collect()
-            } else {
-                attrs.classes.iter().collect()
-            };
-
-            if !classes.is_empty() {
-                self.write(" class=\"")?;
-                for (i, class) in classes.iter().enumerate() {
-                    if i > 0 {
-                        self.write(" ")?;
-                    }
-                    escape_html(&mut self.writer, class)?;
-                }
-                self.write("\"")?;
-            }
-
-            // Write other attrs
-            for (attr, value) in &attrs.attrs {
-                self.write(" ")?;
-                escape_html(&mut self.writer, attr)?;
-                self.write("=\"")?;
-                escape_html(&mut self.writer, value)?;
-                self.write("\"")?;
-            }
-
-            self.write(">")?;
-            Ok(true)
-        } else {
-            Ok(false)
-        }
-    }
-
-    /// Close active wrapper element if one is open
-    fn close_wrapper(&mut self) -> Result<(), fmt::Error> {
-        if let Some(wrapper) = self.active_wrapper.take() {
-            match wrapper {
-                WrapperElement::Aside => self.write("</aside>")?,
-                WrapperElement::Div => self.write("</div>")?,
-            }
-        }
-        Ok(())
-    }
-
-    fn process_event(&mut self, event: Event<'_>, range: Range<usize>) -> Result<(), fmt::Error> {
-        use Event::*;
-
-        match event {
-            Start(tag) => self.start_tag(tag, range)?,
-            End(tag) => self.end_tag(tag, range)?,
-            Text(text) => {
-                // If buffering code, append to buffer instead of writing
-                if let Some((_, ref mut buffer)) = self.code_buffer {
-                    buffer.push_str(&text);
-
-                    // Track byte and char ranges for code block content
-                    let text_char_len = text.chars().count();
-                    let text_byte_len = text.len();
-                    if let Some(ref mut code_byte_range) = self.code_buffer_byte_range {
-                        // Extend existing ranges
-                        code_byte_range.end = range.end;
-                        if let Some(ref mut code_char_range) = self.code_buffer_char_range {
-                            code_char_range.end = self.last_char_offset + text_char_len;
-                        }
-                    } else {
-                        // First text in code block - start tracking
-                        self.code_buffer_byte_range = Some(range.clone());
-                        self.code_buffer_char_range =
-                            Some(self.last_char_offset..self.last_char_offset + text_char_len);
-                    }
-                    // Update offsets so paragraph boundary is correct
-                    self.last_char_offset += text_char_len;
-                    self.last_byte_offset += text_byte_len;
-                } else if !self.in_non_writing_block {
-                    // Escape HTML and count chars in one pass
-                    let char_start = self.last_char_offset;
-                    let text_char_len =
-                        escape_html_body_text_with_char_count(&mut self.writer, &text)?;
-                    let char_end = char_start + text_char_len;
-
-                    // Text becomes a text node child of the current container
-                    if text_char_len > 0 {
-                        self.current_node_child_count += 1;
-                    }
-
-                    // Record offset mapping
-                    self.record_mapping(range.clone(), char_start..char_end);
-
-                    // Update char offset tracking
-                    self.last_char_offset = char_end;
-                    self.end_newline = text.ends_with('\n');
-                }
-            }
-            Code(text) => {
-                let format_start = self.last_char_offset;
-                let raw_text = &self.source[range.clone()];
-
-                // Track opening span index so we can set formatted_range later
-                let opening_span_idx = if raw_text.starts_with('`') {
-                    let syn_id = self.gen_syn_id();
-                    let char_start = self.last_char_offset;
-                    let backtick_char_end = char_start + 1;
-                    write!(
-                        &mut self.writer,
-                        "<span class=\"md-syntax-inline\" data-syn-id=\"{}\" data-char-start=\"{}\" data-char-end=\"{}\" spellcheck=\"false\">`</span>",
-                        syn_id, char_start, backtick_char_end
-                    )?;
-                    self.syntax_spans.push(SyntaxSpanInfo {
-                        syn_id,
-                        char_range: char_start..backtick_char_end,
-                        syntax_type: SyntaxType::Inline,
-                        formatted_range: None, // Set after we know the full range
-                    });
-                    self.last_char_offset += 1;
-                    Some(self.syntax_spans.len() - 1)
-                } else {
-                    None
-                };
-
-                self.write("<code>")?;
-
-                // Track offset mapping for code content
-                let content_char_start = self.last_char_offset;
-                let text_char_len = escape_html_body_text_with_char_count(&mut self.writer, &text)?;
-                let content_char_end = content_char_start + text_char_len;
-
-                // Record offset mapping (code content is visible)
-                self.record_mapping(range.clone(), content_char_start..content_char_end);
-                self.last_char_offset = content_char_end;
-
-                self.write("</code>")?;
-
-                // Emit closing backtick and track it
-                if raw_text.ends_with('`') {
-                    let syn_id = self.gen_syn_id();
-                    let backtick_char_start = self.last_char_offset;
-                    let backtick_char_end = backtick_char_start + 1;
-                    write!(
-                        &mut self.writer,
-                        "<span class=\"md-syntax-inline\" data-syn-id=\"{}\" data-char-start=\"{}\" data-char-end=\"{}\" spellcheck=\"false\">`</span>",
-                        syn_id, backtick_char_start, backtick_char_end
-                    )?;
-
-                    // Now we know the full formatted range
-                    let formatted_range = format_start..backtick_char_end;
-
-                    self.syntax_spans.push(SyntaxSpanInfo {
-                        syn_id,
-                        char_range: backtick_char_start..backtick_char_end,
-                        syntax_type: SyntaxType::Inline,
-                        formatted_range: Some(formatted_range.clone()),
-                    });
-
-                    // Update opening span with formatted_range
-                    if let Some(idx) = opening_span_idx {
-                        self.syntax_spans[idx].formatted_range = Some(formatted_range);
-                    }
-
-                    self.last_char_offset += 1;
-                }
-            }
-            InlineMath(text) => {
-                // Math rendering follows embed pattern: syntax spans hide when cursor outside,
-                // rendered content always visible
-                let raw_text = &self.source[range.clone()];
-                let syn_id = self.gen_syn_id();
-                let opening_char_start = self.last_char_offset;
-
-                // Calculate char positions
-                let text_char_len = text.chars().count();
-                let opening_char_end = opening_char_start + 1; // "$"
-                let content_char_start = opening_char_end;
-                let content_char_end = content_char_start + text_char_len;
-                let closing_char_start = content_char_end;
-                let closing_char_end = closing_char_start + 1; // "$"
-                let formatted_range = opening_char_start..closing_char_end;
-
-                // 1. Emit opening $ syntax span
-                if raw_text.starts_with('$') {
-                    write!(
-                        &mut self.writer,
-                        "<span class=\"md-syntax-inline\" data-syn-id=\"{}\" data-char-start=\"{}\" data-char-end=\"{}\" spellcheck=\"false\">$</span>",
-                        syn_id, opening_char_start, opening_char_end
-                    )?;
-                    self.syntax_spans.push(SyntaxSpanInfo {
-                        syn_id: syn_id.clone(),
-                        char_range: opening_char_start..opening_char_end,
-                        syntax_type: SyntaxType::Inline,
-                        formatted_range: Some(formatted_range.clone()),
-                    });
-                    self.record_mapping(
-                        range.start..range.start + 1,
-                        opening_char_start..opening_char_end,
-                    );
-                }
-
-                // 2. Emit raw LaTeX content (hidden with syntax when cursor outside)
-                write!(
-                    &mut self.writer,
-                    "<span class=\"math-source\" data-syn-id=\"{}\" data-char-start=\"{}\" data-char-end=\"{}\" spellcheck=\"false\">",
-                    syn_id, content_char_start, content_char_end
-                )?;
-                escape_html(&mut self.writer, &text)?;
-                self.write("</span>")?;
-                self.syntax_spans.push(SyntaxSpanInfo {
-                    syn_id: syn_id.clone(),
-                    char_range: content_char_start..content_char_end,
-                    syntax_type: SyntaxType::Inline,
-                    formatted_range: Some(formatted_range.clone()),
-                });
-                self.record_mapping(
-                    range.start + 1..range.end - 1,
-                    content_char_start..content_char_end,
-                );
-
-                // 3. Emit closing $ syntax span
-                if raw_text.ends_with('$') {
-                    write!(
-                        &mut self.writer,
-                        "<span class=\"md-syntax-inline\" data-syn-id=\"{}\" data-char-start=\"{}\" data-char-end=\"{}\" spellcheck=\"false\">$</span>",
-                        syn_id, closing_char_start, closing_char_end
-                    )?;
-                    self.syntax_spans.push(SyntaxSpanInfo {
-                        syn_id: syn_id.clone(),
-                        char_range: closing_char_start..closing_char_end,
-                        syntax_type: SyntaxType::Inline,
-                        formatted_range: Some(formatted_range.clone()),
-                    });
-                    self.record_mapping(
-                        range.end - 1..range.end,
-                        closing_char_start..closing_char_end,
-                    );
-                }
-
-                // 4. Emit rendered MathML (always visible, not tied to syn_id)
-                // Include data-char-target so clicking moves cursor into the math region
-                // contenteditable="false" so DOM walker skips this for offset counting
-                match weaver_renderer::math::render_math(&text, false) {
-                    weaver_renderer::math::MathResult::Success(mathml) => {
-                        write!(
-                            &mut self.writer,
-                            "<span class=\"math math-inline math-rendered math-clickable\" contenteditable=\"false\" data-char-target=\"{}\">{}</span>",
-                            content_char_start, mathml
-                        )?;
-                    }
-                    weaver_renderer::math::MathResult::Error { html, .. } => {
-                        // Show error indicator (also always visible)
-                        self.write(&html)?;
-                    }
-                }
-
-                self.last_char_offset = closing_char_end;
-            }
-            DisplayMath(text) => {
-                // Math rendering follows embed pattern: syntax spans hide when cursor outside,
-                // rendered content always visible
-                let raw_text = &self.source[range.clone()];
-                let syn_id = self.gen_syn_id();
-                let opening_char_start = self.last_char_offset;
-
-                // Calculate char positions
-                let text_char_len = text.chars().count();
-                let opening_char_end = opening_char_start + 2; // "$$"
-                let content_char_start = opening_char_end;
-                let content_char_end = content_char_start + text_char_len;
-                let closing_char_start = content_char_end;
-                let closing_char_end = closing_char_start + 2; // "$$"
-                let formatted_range = opening_char_start..closing_char_end;
-
-                // 1. Emit opening $$ syntax span
-                // Use Block syntax type so visibility is based on "cursor in same paragraph"
-                if raw_text.starts_with("$$") {
-                    write!(
-                        &mut self.writer,
-                        "<span class=\"md-syntax-block\" data-syn-id=\"{}\" data-char-start=\"{}\" data-char-end=\"{}\" spellcheck=\"false\">$$</span>",
-                        syn_id, opening_char_start, opening_char_end
-                    )?;
-                    self.syntax_spans.push(SyntaxSpanInfo {
-                        syn_id: syn_id.clone(),
-                        char_range: opening_char_start..opening_char_end,
-                        syntax_type: SyntaxType::Block,
-                        formatted_range: Some(formatted_range.clone()),
-                    });
-                    self.record_mapping(
-                        range.start..range.start + 2,
-                        opening_char_start..opening_char_end,
-                    );
-                }
-
-                // 2. Emit raw LaTeX content (hidden with syntax when cursor outside)
-                write!(
-                    &mut self.writer,
-                    "<span class=\"math-source\" data-syn-id=\"{}\" data-char-start=\"{}\" data-char-end=\"{}\" spellcheck=\"false\">",
-                    syn_id, content_char_start, content_char_end
-                )?;
-                escape_html(&mut self.writer, &text)?;
-                self.write("</span>")?;
-                self.syntax_spans.push(SyntaxSpanInfo {
-                    syn_id: syn_id.clone(),
-                    char_range: content_char_start..content_char_end,
-                    syntax_type: SyntaxType::Block,
-                    formatted_range: Some(formatted_range.clone()),
-                });
-                self.record_mapping(
-                    range.start + 2..range.end - 2,
-                    content_char_start..content_char_end,
-                );
-
-                // 3. Emit closing $$ syntax span
-                if raw_text.ends_with("$$") {
-                    write!(
-                        &mut self.writer,
-                        "<span class=\"md-syntax-block\" data-syn-id=\"{}\" data-char-start=\"{}\" data-char-end=\"{}\" spellcheck=\"false\">$$</span>",
-                        syn_id, closing_char_start, closing_char_end
-                    )?;
-                    self.syntax_spans.push(SyntaxSpanInfo {
-                        syn_id: syn_id.clone(),
-                        char_range: closing_char_start..closing_char_end,
-                        syntax_type: SyntaxType::Block,
-                        formatted_range: Some(formatted_range.clone()),
-                    });
-                    self.record_mapping(
-                        range.end - 2..range.end,
-                        closing_char_start..closing_char_end,
-                    );
-                }
-
-                // 4. Emit rendered MathML (always visible, not tied to syn_id)
-                // Include data-char-target so clicking moves cursor into the math region
-                // contenteditable="false" so DOM walker skips this for offset counting
-                match weaver_renderer::math::render_math(&text, true) {
-                    weaver_renderer::math::MathResult::Success(mathml) => {
-                        write!(
-                            &mut self.writer,
-                            "<span class=\"math math-display math-rendered math-clickable\" contenteditable=\"false\" data-char-target=\"{}\">{}</span>",
-                            content_char_start, mathml
-                        )?;
-                    }
-                    weaver_renderer::math::MathResult::Error { html, .. } => {
-                        // Show error indicator (also always visible)
-                        self.write(&html)?;
-                    }
-                }
-
-                self.last_char_offset = closing_char_end;
-            }
-            Html(html) => {
-                // Track offset mapping for raw HTML
-                let char_start = self.last_char_offset;
-                let html_char_len = html.chars().count();
-                let char_end = char_start + html_char_len;
-
-                self.write(&html)?;
-
-                // Record mapping for inline HTML
-                self.record_mapping(range.clone(), char_start..char_end);
-                self.last_char_offset = char_end;
-            }
-            InlineHtml(html) => {
-                // Track offset mapping for raw HTML
-                let char_start = self.last_char_offset;
-                let html_char_len = html.chars().count();
-                let char_end = char_start + html_char_len;
-                self.write(r#"<span class="html-embed html-embed-inline">"#)?;
-                self.write(&html)?;
-                self.write("</span>")?;
-                // Record mapping for inline HTML
-                self.record_mapping(range.clone(), char_start..char_end);
-                self.last_char_offset = char_end;
-            }
-            SoftBreak => {
-                // Emit <br> for visual line break, plus a space for cursor positioning.
-                // This space maps to the \n so the cursor can land here when navigating.
-                let char_start = self.last_char_offset;
-
-                // Emit <br>
-                self.write("<br />")?;
-                self.current_node_child_count += 1;
-
-                // Emit space for cursor positioning - this gives the browser somewhere
-                // to place the cursor when navigating to this line
-                self.write("\u{200B}")?;
-                self.current_node_child_count += 1;
-
-                // Map the space to the newline position - cursor landing here means
-                // we're at the end of the line (after the \n)
-                if let Some(ref node_id) = self.current_node_id {
-                    let mapping = OffsetMapping {
-                        byte_range: range.clone(),
-                        char_range: char_start..char_start + 1,
-                        node_id: node_id.clone(),
-                        char_offset_in_node: self.current_node_char_offset,
-                        child_index: None,
-                        utf16_len: 1, // the space we emitted
-                    };
-                    self.offset_maps.push(mapping);
-                    self.current_node_char_offset += 1;
-                }
-
-                self.last_char_offset = char_start + 1; // +1 for the \n
-            }
-            HardBreak => {
-                // Emit the two spaces as visible (dimmed) text, then <br>
-                let gap = &self.source[range.clone()];
-                if gap.ends_with('\n') {
-                    let spaces = &gap[..gap.len() - 1]; // everything except the \n
-                    let char_start = self.last_char_offset;
-                    let spaces_char_len = spaces.chars().count();
-                    let char_end = char_start + spaces_char_len;
-
-                    // Emit and map the visible spaces
-                    let syn_id = self.gen_syn_id();
-                    write!(
-                        &mut self.writer,
-                        "<span class=\"md-placeholder\" data-syn-id=\"{}\" data-char-start=\"{}\" data-char-end=\"{}\">",
-                        syn_id, char_start, char_end
-                    )?;
-                    escape_html(&mut self.writer, spaces)?;
-                    self.write("</span>")?;
-
-                    // Count this span as a child
-                    self.current_node_child_count += 1;
-
-                    self.record_mapping(
-                        range.start..range.start + spaces.len(),
-                        char_start..char_end,
-                    );
-
-                    // Now the actual line break <br>
-                    self.write("<br />")?;
-
-                    // Count the <br> as a child
-                    self.current_node_child_count += 1;
-
-                    // After <br>, emit plain zero-width space for cursor positioning
-                    self.write("\u{200B}")?;
-
-                    // Count the zero-width space text node as a child
-                    self.current_node_child_count += 1;
-
-                    // Map the newline position to the zero-width space text node
-                    if let Some(ref node_id) = self.current_node_id {
-                        let newline_char_offset = char_start + spaces_char_len;
-                        let mapping = OffsetMapping {
-                            byte_range: range.start + spaces.len()..range.end,
-                            char_range: newline_char_offset..newline_char_offset + 1,
-                            node_id: node_id.clone(),
-                            char_offset_in_node: self.current_node_char_offset,
-                            child_index: None, // text node - TreeWalker will find it
-                            utf16_len: 1,      // zero-width space is 1 UTF-16 unit
-                        };
-                        self.offset_maps.push(mapping);
-
-                        // Increment char offset - TreeWalker will encounter this text node
-                        self.current_node_char_offset += 1;
-                    }
-
-                    self.last_char_offset = char_start + spaces_char_len + 1; // +1 for \n
-                } else {
-                    // Fallback: just <br>
-                    self.write("<br />")?;
-                }
-            }
-            Rule => {
-                if !self.end_newline {
-                    self.write("\n")?;
-                }
-
-                // Emit syntax span before the rendered element
-                if range.start < range.end {
-                    let raw_text = &self.source[range];
-                    let trimmed = raw_text.trim();
-                    if !trimmed.is_empty() {
-                        let syn_id = self.gen_syn_id();
-                        let char_start = self.last_char_offset;
-                        let char_len = trimmed.chars().count();
-                        let char_end = char_start + char_len;
-
-                        write!(
-                            &mut self.writer,
-                            "<span class=\"md-syntax-block\" data-syn-id=\"{}\" data-char-start=\"{}\" data-char-end=\"{}\" spellcheck=\"false\">",
-                            syn_id, char_start, char_end
-                        )?;
-                        escape_html(&mut self.writer, trimmed)?;
-                        self.write("</span>")?;
-
-                        self.syntax_spans.push(SyntaxSpanInfo {
-                            syn_id,
-                            char_range: char_start..char_end,
-                            syntax_type: SyntaxType::Block,
-                            formatted_range: None,
-                        });
-                    }
-                }
-
-                // Wrap <hr /> in toggle-block for future cursor-based toggling
-                self.write("<div class=\"toggle-block\"><hr /></div>")?;
-            }
-            FootnoteReference(name) => {
-                // Emit [^name] as styled (but NOT hidden) inline span
-                let raw_text = &self.source[range.clone()];
-                let char_start = self.last_char_offset;
-                let syntax_char_len = raw_text.chars().count();
-                let char_end = char_start + syntax_char_len;
-
-                // Use footnote-ref class for styling, not md-syntax-inline (which hides)
-                write!(
-                    &mut self.writer,
-                    "<span class=\"footnote-ref\" data-char-start=\"{}\" data-char-end=\"{}\" data-footnote=\"{}\">",
-                    char_start, char_end, name
-                )?;
-                escape_html(&mut self.writer, raw_text)?;
-                self.write("</span>")?;
-
-                // Record offset mapping
-                self.record_mapping(range.clone(), char_start..char_end);
-
-                // Count as child
-                self.current_node_child_count += 1;
-
-                // Update tracking
-                self.last_char_offset = char_end;
-                self.last_byte_offset = range.end;
-            }
-            TaskListMarker(checked) => {
-                // Emit the [ ] or [x] syntax
-                if range.start < range.end {
-                    let raw_text = &self.source[range];
-                    if let Some(bracket_pos) = raw_text.find('[') {
-                        let end_pos = raw_text.find(']').map(|p| p + 1).unwrap_or(bracket_pos + 3);
-                        let syntax = &raw_text[bracket_pos..end_pos.min(raw_text.len())];
-
-                        let syn_id = self.gen_syn_id();
-                        let char_start = self.last_char_offset;
-                        let syntax_char_len = syntax.chars().count();
-                        let char_end = char_start + syntax_char_len;
-
-                        write!(
-                            &mut self.writer,
-                            "<span class=\"md-syntax-inline\" data-syn-id=\"{}\" data-char-start=\"{}\" data-char-end=\"{}\" spellcheck=\"false\">",
-                            syn_id, char_start, char_end
-                        )?;
-                        escape_html(&mut self.writer, syntax)?;
-                        self.write("</span> ")?;
-
-                        self.syntax_spans.push(SyntaxSpanInfo {
-                            syn_id,
-                            char_range: char_start..char_end,
-                            syntax_type: SyntaxType::Inline,
-                            formatted_range: None,
-                        });
-                    }
-                }
-
-                if checked {
-                    self.write("<input disabled=\"\" type=\"checkbox\" checked=\"\"/>")?;
-                } else {
-                    self.write("<input disabled=\"\" type=\"checkbox\"/>")?;
-                }
-            }
-            WeaverBlock(text) => {
-                // Buffer WeaverBlock content for parsing on End
-                self.weaver_block_buffer.push_str(&text);
-            }
-        }
-        Ok(())
-    }
-
-    pub fn new_with_all_offsets(
-        source: &'a str,
-        source_text: &'a LoroText,
-        events: I,
-        node_id_offset: usize,
-        syn_id_offset: usize,
-        char_offset_base: usize,
-        byte_offset_base: usize,
-    ) -> Self {
-        Self {
-            source,
-            source_text,
-            events,
-            writer: SegmentedWriter::new(),
-            last_byte_offset: byte_offset_base,
-            last_char_offset: char_offset_base,
-            end_newline: true,
-            in_non_writing_block: false,
-            table_state: TableState::Head,
-            table_alignments: vec![],
-            table_cell_index: 0,
-            numbers: HashMap::new(),
-            embed_provider: None,
-            image_resolver: None,
-            entry_index: None,
-            code_buffer: None,
-            code_buffer_byte_range: None,
-            code_buffer_char_range: None,
-            code_block_char_start: None,
-            code_block_opening_span_idx: None,
-            pending_blockquote_range: None,
-            render_tables_as_markdown: true,
-            table_start_offset: None,
-            offset_maps: Vec::new(),
-            node_id_prefix: None,
-            auto_increment_prefix: None,
-            static_prefix_override: None,
-            current_paragraph_index: 0,
-            next_node_id: node_id_offset,
-            current_node_id: None,
-            current_node_char_offset: 0,
-            current_node_child_count: 0,
-            utf16_checkpoints: vec![(0, 0)],
-            paragraph_ranges: Vec::new(),
-            current_paragraph_start: None,
-            list_depth: 0,
-            in_footnote_def: false,
-            syntax_spans: Vec::new(),
-            next_syn_id: syn_id_offset,
-            pending_inline_formats: Vec::new(),
-            ref_collector: weaver_common::RefCollector::new(),
-            offset_maps_by_para: Vec::new(),
-            syntax_spans_by_para: Vec::new(),
-            refs_by_para: Vec::new(),
-            pending_block_attrs: None,
-            active_wrapper: None,
-            weaver_block_buffer: String::new(),
-            weaver_block_char_start: None,
-            footnote_ref_spans: HashMap::new(),
-            current_footnote_def: None,
-            _phantom: std::marker::PhantomData,
-        }
-    }
-
-    /// Add an embed content provider
-    pub fn with_embed_provider(mut self, provider: E) -> EditorWriter<'a, I, E, R> {
-        self.embed_provider = Some(provider);
-        self
-    }
-
-    /// Add an image resolver for mapping markdown image URLs to CDN URLs
-    pub fn with_image_resolver<R2: ImageResolver>(
-        self,
-        resolver: R2,
-    ) -> EditorWriter<'a, I, E, R2> {
-        EditorWriter {
-            source: self.source,
-            source_text: self.source_text,
-            events: self.events,
-            writer: self.writer,
-            last_byte_offset: self.last_byte_offset,
-            last_char_offset: self.last_char_offset,
-            end_newline: self.end_newline,
-            in_non_writing_block: self.in_non_writing_block,
-            table_state: self.table_state,
-            table_alignments: self.table_alignments,
-            table_cell_index: self.table_cell_index,
-            numbers: self.numbers,
-            embed_provider: self.embed_provider,
-            image_resolver: Some(resolver),
-            entry_index: self.entry_index,
-            code_buffer: self.code_buffer,
-            code_buffer_byte_range: self.code_buffer_byte_range,
-            code_buffer_char_range: self.code_buffer_char_range,
-            code_block_char_start: self.code_block_char_start,
-            code_block_opening_span_idx: self.code_block_opening_span_idx,
-            pending_blockquote_range: self.pending_blockquote_range,
-            render_tables_as_markdown: self.render_tables_as_markdown,
-            table_start_offset: self.table_start_offset,
-            offset_maps: self.offset_maps,
-            node_id_prefix: self.node_id_prefix,
-            auto_increment_prefix: self.auto_increment_prefix,
-            static_prefix_override: self.static_prefix_override,
-            current_paragraph_index: self.current_paragraph_index,
-            next_node_id: self.next_node_id,
-            current_node_id: self.current_node_id,
-            current_node_char_offset: self.current_node_char_offset,
-            current_node_child_count: self.current_node_child_count,
-            utf16_checkpoints: self.utf16_checkpoints,
-            paragraph_ranges: self.paragraph_ranges,
-            current_paragraph_start: self.current_paragraph_start,
-            list_depth: self.list_depth,
-            in_footnote_def: self.in_footnote_def,
-            syntax_spans: self.syntax_spans,
-            next_syn_id: self.next_syn_id,
-            pending_inline_formats: self.pending_inline_formats,
-            ref_collector: self.ref_collector,
-            offset_maps_by_para: self.offset_maps_by_para,
-            syntax_spans_by_para: self.syntax_spans_by_para,
-            refs_by_para: self.refs_by_para,
-            pending_block_attrs: self.pending_block_attrs,
-            active_wrapper: self.active_wrapper,
-            weaver_block_buffer: self.weaver_block_buffer,
-            weaver_block_char_start: self.weaver_block_char_start,
-            footnote_ref_spans: self.footnote_ref_spans,
-            current_footnote_def: self.current_footnote_def,
-            _phantom: std::marker::PhantomData,
-        }
-    }
-
-    /// Add an entry index for wikilink resolution feedback
-    pub fn with_entry_index(mut self, index: &'a EntryIndex) -> Self {
-        self.entry_index = Some(index);
-        self
-    }
+pub mod embed;
 
-    /// Set a prefix for node IDs (typically the paragraph ID).
-    /// This makes node IDs paragraph-scoped and stable across re-renders.
-    /// Use this for single-paragraph renders where the paragraph ID is known.
-    pub fn with_node_id_prefix(mut self, prefix: &str) -> Self {
-        self.node_id_prefix = Some(prefix.to_string());
-        self.next_node_id = 0; // Reset counter since each paragraph is independent
-        self
-    }
+// Re-export everything from core
+pub use weaver_editor_core::{
+    EditorRope, EditorWriter, EmbedContentProvider, ImageResolver, OffsetMapping, SegmentedWriter,
+    SyntaxSpanInfo, SyntaxType, TextBuffer, WriterResult,
+};
 
-    /// Enable auto-incrementing paragraph prefixes for multi-paragraph renders.
-    /// Each paragraph gets prefix "p-{N}" where N starts at `start_id` and increments.
-    /// Node IDs reset to 0 for each paragraph, giving "p-{N}-n0", "p-{N}-n1", etc.
-    pub fn with_auto_incrementing_prefix(mut self, start_id: usize) -> Self {
-        self.auto_increment_prefix = Some(start_id);
-        self.node_id_prefix = Some(format!("p-{}", start_id));
-        self.next_node_id = 0;
-        self
-    }
-}
+// App-specific image resolver
+pub use embed::EditorImageResolver;
diff --git a/crates/weaver-app/src/components/editor/writer/embed.rs b/crates/weaver-app/src/components/editor/writer/embed.rs
index cbbd5f2..79cfa8c 100644
--- a/crates/weaver-app/src/components/editor/writer/embed.rs
+++ b/crates/weaver-app/src/components/editor/writer/embed.rs
@@ -1,62 +1,13 @@
-use core::fmt;
-use std::ops::Range;
+//! App-specific image resolver for the editor.
+//!
+//! Provides EditorImageResolver which maps image names to URLs based on
+//! image state (pending upload, draft, published).
 
 use jacquard::types::{ident::AtIdentifier, string::Rkey};
-use markdown_weaver::{CowStr, EmbedType, Event, Tag};
-use markdown_weaver_escape::{StrWrite, escape_html};
-use weaver_common::ResolvedContent;
+use weaver_editor_core::ImageResolver;
 
-use crate::components::editor::{
-    SyntaxSpanInfo, SyntaxType, document::EditorImage, writer::EditorWriter,
-};
+use crate::components::editor::document::EditorImage;
 
-/// Synchronous callback for injecting embed content
-///
-/// Takes the embed tag and returns optional HTML content to inject.
-pub trait EmbedContentProvider {
-    fn get_embed_content(&self, tag: &Tag<'_>) -> Option<String>;
-}
-
-impl EmbedContentProvider for () {
-    fn get_embed_content(&self, _tag: &Tag<'_>) -> Option<String> {
-        None
-    }
-}
-
-impl EmbedContentProvider for &ResolvedContent {
-    fn get_embed_content(&self, tag: &Tag<'_>) -> Option<String> {
-        if let Tag::Embed { dest_url, .. } = tag {
-            let url = dest_url.as_ref();
-            if url.starts_with("at://") {
-                if let Ok(at_uri) = jacquard::types::string::AtUri::new(url) {
-                    return ResolvedContent::get_embed_content(self, &at_uri)
-                        .map(|s| s.to_string());
-                }
-            }
-        }
-        None
-    }
-}
-
-/// Resolves image URLs to CDN URLs based on stored images.
-///
-/// The markdown may reference images by name (e.g., "photo.jpg" or "/notebook/image.png").
-/// This trait maps those names to the actual CDN URL using the blob CID and owner DID.
-pub trait ImageResolver {
-    /// Resolve an image URL from markdown to a CDN URL.
-    ///
-    /// Returns `Some(cdn_url)` if the image is found, `None` to use the original URL.
-    fn resolve_image_url(&self, url: &str) -> Option<String>;
-}
-
-impl ImageResolver for () {
-    fn resolve_image_url(&self, _url: &str) -> Option<String> {
-        None
-    }
-}
-
-/// Concrete image resolver that maps image names to URLs.
-///
 /// Resolved image path type
 #[derive(Clone, Debug)]
 enum ResolvedImage {
@@ -201,171 +152,3 @@ impl ImageResolver for EditorImageResolver {
     }
 }
 
-impl ImageResolver for &EditorImageResolver {
-    fn resolve_image_url(&self, url: &str) -> Option<String> {
-        (*self).resolve_image_url(url)
-    }
-}
-
-impl<'a, I: Iterator<Item = (Event<'a>, Range<usize>)>, E: EmbedContentProvider, R: ImageResolver>
-    EditorWriter<'a, I, E, R>
-{
-    pub(crate) fn write_embed(
-        &mut self,
-        range: Range<usize>,
-        embed_type: EmbedType,
-        dest_url: CowStr<'_>,
-        title: CowStr<'_>,
-        id: CowStr<'_>,
-        attrs: Option<markdown_weaver::WeaverAttributes<'_>>,
-    ) -> Result<(), fmt::Error> {
-        // Embed rendering: all syntax elements share one syn_id for visibility toggling
-        // Structure: ![[  url-as-link  ]]  <embed-content>
-        let raw_text = &self.source[range.clone()];
-        let syn_id = self.gen_syn_id();
-        let opening_char_start = self.last_char_offset;
-
-        // Extract the URL from raw text (between ![[ and ]])
-        let url_text = if raw_text.starts_with("![[") && raw_text.ends_with("]]") {
-            &raw_text[3..raw_text.len() - 2]
-        } else {
-            dest_url.as_ref()
-        };
-
-        // Calculate char positions
-        let url_char_len = url_text.chars().count();
-        let opening_char_end = opening_char_start + 3; // "![["
-        let url_char_start = opening_char_end;
-        let url_char_end = url_char_start + url_char_len;
-        let closing_char_start = url_char_end;
-        let closing_char_end = closing_char_start + 2; // "]]"
-        let formatted_range = opening_char_start..closing_char_end;
-
-        // 1. Emit opening ![[ syntax span
-        if raw_text.starts_with("![[") {
-            write!(
-                &mut self.writer,
-                "<span class=\"md-syntax-inline\" data-syn-id=\"{}\" data-char-start=\"{}\" data-char-end=\"{}\" spellcheck=\"false\">![[</span>",
-                syn_id, opening_char_start, opening_char_end
-            )?;
-
-            self.syntax_spans.push(SyntaxSpanInfo {
-                syn_id: syn_id.clone(),
-                char_range: opening_char_start..opening_char_end,
-                syntax_type: SyntaxType::Inline,
-                formatted_range: Some(formatted_range.clone()),
-            });
-
-            self.record_mapping(
-                range.start..range.start + 3,
-                opening_char_start..opening_char_end,
-            );
-        }
-
-        // 2. Emit URL as a clickable link (same syn_id, shown/hidden with syntax)
-        let url = dest_url.as_ref();
-        let link_href = if url.starts_with("at://") {
-            format!("https://alpha.weaver.sh/record/{}", url)
-        } else {
-            url.to_string()
-        };
-
-        write!(
-            &mut self.writer,
-            "<a class=\"image-alt embed-url\" href=\"{}\" data-syn-id=\"{}\" data-char-start=\"{}\" data-char-end=\"{}\" target=\"_blank\">",
-            link_href, syn_id, url_char_start, url_char_end
-        )?;
-        escape_html(&mut self.writer, url_text)?;
-        self.write("</a>")?;
-
-        self.syntax_spans.push(SyntaxSpanInfo {
-            syn_id: syn_id.clone(),
-            char_range: url_char_start..url_char_end,
-            syntax_type: SyntaxType::Inline,
-            formatted_range: Some(formatted_range.clone()),
-        });
-
-        self.record_mapping(range.start + 3..range.end - 2, url_char_start..url_char_end);
-
-        // 3. Emit closing ]] syntax span
-        if raw_text.ends_with("]]") {
-            write!(
-                &mut self.writer,
-                "<span class=\"md-syntax-inline\" data-syn-id=\"{}\" data-char-start=\"{}\" data-char-end=\"{}\" spellcheck=\"false\">]]</span>",
-                syn_id, closing_char_start, closing_char_end
-            )?;
-
-            self.syntax_spans.push(SyntaxSpanInfo {
-                syn_id: syn_id.clone(),
-                char_range: closing_char_start..closing_char_end,
-                syntax_type: SyntaxType::Inline,
-                formatted_range: Some(formatted_range.clone()),
-            });
-
-            self.record_mapping(
-                range.end - 2..range.end,
-                closing_char_start..closing_char_end,
-            );
-        }
-
-        // Collect AT URI for later resolution
-        if url.starts_with("at://") || url.starts_with("did:") {
-            self.ref_collector.add_at_embed(
-                url,
-                if title.is_empty() {
-                    None
-                } else {
-                    Some(title.as_ref())
-                },
-            );
-        }
-
-        // 4. Emit the actual embed content
-        // Try to get content from attributes first
-        let content_from_attrs = if let Some(ref attrs) = attrs {
-            attrs
-                .attrs
-                .iter()
-                .find(|(k, _)| k.as_ref() == "content")
-                .map(|(_, v)| v.as_ref().to_string())
-        } else {
-            None
-        };
-
-        // If no content in attrs, try provider
-        let content = if let Some(content) = content_from_attrs {
-            Some(content)
-        } else if let Some(ref provider) = self.embed_provider {
-            let tag = Tag::Embed {
-                embed_type,
-                dest_url: dest_url.clone(),
-                title: title.clone(),
-                id: id.clone(),
-                attrs: attrs.clone(),
-            };
-            provider.get_embed_content(&tag)
-        } else {
-            None
-        };
-
-        if let Some(html_content) = content {
-            // Write the pre-rendered content directly
-            self.write(&html_content)?;
-        } else {
-            // Fallback: render as placeholder div (iframe doesn't make sense for at:// URIs)
-            self.write("<div class=\"atproto-embed atproto-embed-placeholder\">")?;
-            self.write("<span class=\"embed-loading\">Loading embed...</span>")?;
-            self.write("</div>")?;
-        }
-
-        // Consume the text events for the URL (they're still in the iterator)
-        // Use consume_until_end() since we already wrote the URL from source
-        self.consume_until_end();
-
-        // Update offsets
-        self.last_char_offset = closing_char_end;
-        self.last_byte_offset = range.end;
-
-        Ok(())
-    }
-}
diff --git a/crates/weaver-app/src/components/editor/writer/segmented.rs b/crates/weaver-app/src/components/editor/writer/segmented.rs
deleted file mode 100644
index 4cd7b96..0000000
--- a/crates/weaver-app/src/components/editor/writer/segmented.rs
+++ /dev/null
@@ -1,66 +0,0 @@
-use core::fmt;
-
-use markdown_weaver_escape::StrWrite;
-
-/// Writer that segments output by paragraph boundaries.
-///
-/// Each paragraph's HTML is written to a separate String in the segments Vec.
-/// Call `new_segment()` at paragraph boundaries to start a new segment.
-#[derive(Debug, Clone, Default)]
-pub struct SegmentedWriter {
-    pub segments: Vec<String>,
-}
-
-#[allow(dead_code)]
-impl SegmentedWriter {
-    pub fn new() -> Self {
-        Self {
-            segments: vec![String::new()],
-        }
-    }
-
-    /// Start a new segment for the next paragraph.
-    pub fn new_segment(&mut self) {
-        self.segments.push(String::new());
-    }
-
-    /// Get the completed segments.
-    pub fn into_segments(self) -> Vec<String> {
-        self.segments
-    }
-
-    /// Get current segment count.
-    pub fn segment_count(&self) -> usize {
-        self.segments.len()
-    }
-}
-
-impl StrWrite for SegmentedWriter {
-    type Error = fmt::Error;
-
-    #[inline]
-    fn write_str(&mut self, s: &str) -> Result<(), Self::Error> {
-        if let Some(segment) = self.segments.last_mut() {
-            segment.push_str(s);
-        }
-        Ok(())
-    }
-
-    #[inline]
-    fn write_fmt(&mut self, args: fmt::Arguments) -> Result<(), Self::Error> {
-        if let Some(segment) = self.segments.last_mut() {
-            fmt::Write::write_fmt(segment, args)?;
-        }
-        Ok(())
-    }
-}
-
-impl fmt::Write for SegmentedWriter {
-    fn write_str(&mut self, s: &str) -> fmt::Result {
-        <Self as StrWrite>::write_str(self, s)
-    }
-
-    fn write_fmt(&mut self, args: fmt::Arguments<'_>) -> fmt::Result {
-        <Self as StrWrite>::write_fmt(self, args)
-    }
-}
diff --git a/crates/weaver-app/src/components/editor/writer/syntax.rs b/crates/weaver-app/src/components/editor/writer/syntax.rs
deleted file mode 100644
index be2903c..0000000
--- a/crates/weaver-app/src/components/editor/writer/syntax.rs
+++ /dev/null
@@ -1,264 +0,0 @@
-use core::fmt;
-use std::ops::Range;
-
-use markdown_weaver::Event;
-use markdown_weaver_escape::{StrWrite, escape_html};
-
-use crate::components::editor::writer::{
-    EditorWriter,
-    embed::{EmbedContentProvider, ImageResolver},
-};
-
-/// Classification of markdown syntax characters
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-pub enum SyntaxType {
-    /// Inline formatting: **, *, ~~, `, $, [, ], (, )
-    Inline,
-    /// Block formatting: #, >, -, *, 1., ```, ---
-    Block,
-}
-
-/// Information about a syntax span for conditional visibility
-#[derive(Debug, Clone, PartialEq, Eq)]
-pub struct SyntaxSpanInfo {
-    /// Unique identifier for this syntax span (e.g., "s0", "s1")
-    pub syn_id: String,
-    /// Source char range this syntax covers (just this marker)
-    pub char_range: Range<usize>,
-    /// Whether this is inline or block-level syntax
-    pub syntax_type: SyntaxType,
-    /// For paired inline syntax (**, *, etc), the full formatted region
-    /// from opening marker through content to closing marker.
-    /// When cursor is anywhere in this range, the syntax is visible.
-    pub formatted_range: Option<Range<usize>>,
-}
-
-impl SyntaxSpanInfo {
-    /// Adjust all position fields by a character delta.
-    ///
-    /// This adjusts both `char_range` and `formatted_range` (if present) together,
-    /// ensuring they stay in sync. Use this instead of manually adjusting fields
-    /// to avoid forgetting one.
-    pub fn adjust_positions(&mut self, char_delta: isize) {
-        self.char_range.start = (self.char_range.start as isize + char_delta) as usize;
-        self.char_range.end = (self.char_range.end as isize + char_delta) as usize;
-        if let Some(ref mut fr) = self.formatted_range {
-            fr.start = (fr.start as isize + char_delta) as usize;
-            fr.end = (fr.end as isize + char_delta) as usize;
-        }
-    }
-}
-
-/// Classify syntax text as inline or block level
-pub(crate) fn classify_syntax(text: &str) -> SyntaxType {
-    let trimmed = text.trim_start();
-
-    // Check for block-level markers
-    if trimmed.starts_with('#')
-        || trimmed.starts_with('>')
-        || trimmed.starts_with("```")
-        || trimmed.starts_with("---")
-        || (trimmed.starts_with('-')
-            && trimmed
-                .chars()
-                .nth(1)
-                .map(|c| c.is_whitespace())
-                .unwrap_or(false))
-        || (trimmed.starts_with('*')
-            && trimmed
-                .chars()
-                .nth(1)
-                .map(|c| c.is_whitespace())
-                .unwrap_or(false))
-        || trimmed
-            .chars()
-            .next()
-            .map(|c| c.is_ascii_digit())
-            .unwrap_or(false)
-            && trimmed.contains('.')
-    {
-        SyntaxType::Block
-    } else {
-        SyntaxType::Inline
-    }
-}
-
-impl<'a, I: Iterator<Item = (Event<'a>, Range<usize>)>, E: EmbedContentProvider, R: ImageResolver>
-    EditorWriter<'a, I, E, R>
-{
-    /// Emit syntax span for a given range and record offset mapping
-    pub(crate) fn emit_syntax(&mut self, range: Range<usize>) -> Result<(), fmt::Error> {
-        if range.start < range.end {
-            let syntax = &self.source[range.clone()];
-            if !syntax.is_empty() {
-                let char_start = self.last_char_offset;
-                let syntax_char_len = syntax.chars().count();
-                let char_end = char_start + syntax_char_len;
-
-                tracing::trace!(
-                    target: "weaver::writer",
-                    byte_range = ?range,
-                    char_range = ?(char_start..char_end),
-                    syntax = %syntax.escape_debug(),
-                    "emit_syntax"
-                );
-
-                // Whitespace-only content (trailing spaces, newlines) should be emitted
-                // as plain text, not wrapped in a hideable syntax span
-                let is_whitespace_only = syntax.trim().is_empty();
-
-                if is_whitespace_only {
-                    // Emit as plain text with tracking span (not hideable)
-                    let created_node = if self.current_node_id.is_none() {
-                        let node_id = self.gen_node_id();
-                        write!(&mut self.writer, "<span id=\"{}\">", node_id)?;
-                        self.begin_node(node_id);
-                        true
-                    } else {
-                        false
-                    };
-
-                    escape_html(&mut self.writer, syntax)?;
-
-                    // Record offset mapping BEFORE end_node (which clears current_node_id)
-                    self.record_mapping(range.clone(), char_start..char_end);
-                    self.last_char_offset = char_end;
-                    self.last_byte_offset = range.end;
-
-                    if created_node {
-                        self.write("</span>")?;
-                        self.end_node();
-                    }
-                } else {
-                    // Real syntax - wrap in hideable span
-                    let syntax_type = classify_syntax(syntax);
-                    let class = match syntax_type {
-                        SyntaxType::Inline => "md-syntax-inline",
-                        SyntaxType::Block => "md-syntax-block",
-                    };
-
-                    // Generate unique ID for this syntax span
-                    let syn_id = self.gen_syn_id();
-
-                    // If we're outside any node, create a wrapper span for tracking
-                    let created_node = if self.current_node_id.is_none() {
-                        let node_id = self.gen_node_id();
-                        write!(
-                            &mut self.writer,
-                            "<span id=\"{}\" class=\"{}\" data-syn-id=\"{}\" data-char-start=\"{}\" data-char-end=\"{}\">",
-                            node_id, class, syn_id, char_start, char_end
-                        )?;
-                        self.begin_node(node_id);
-                        true
-                    } else {
-                        write!(
-                            &mut self.writer,
-                            "<span class=\"{}\" data-syn-id=\"{}\" data-char-start=\"{}\" data-char-end=\"{}\">",
-                            class, syn_id, char_start, char_end
-                        )?;
-                        false
-                    };
-
-                    escape_html(&mut self.writer, syntax)?;
-                    self.write("</span>")?;
-
-                    // Record syntax span info for visibility toggling
-                    self.syntax_spans.push(SyntaxSpanInfo {
-                        syn_id,
-                        char_range: char_start..char_end,
-                        syntax_type,
-                        formatted_range: None,
-                    });
-
-                    // Record offset mapping for this syntax
-                    self.record_mapping(range.clone(), char_start..char_end);
-                    self.last_char_offset = char_end;
-                    self.last_byte_offset = range.end;
-
-                    // Close wrapper if we created one
-                    if created_node {
-                        self.write("</span>")?;
-                        self.end_node();
-                    }
-                }
-            }
-        }
-        Ok(())
-    }
-
-    /// Emit syntax span inside current node with full offset tracking.
-    ///
-    /// Use this for syntax markers that appear inside block elements (headings, lists,
-    /// blockquotes, code fences). Unlike `emit_syntax` which is for gaps and creates
-    /// wrapper nodes, this assumes we're already inside a tracked node.
-    ///
-    /// - Writes `<span class="md-syntax-{class}">{syntax}</span>`
-    /// - Records offset mapping (for cursor positioning)
-    /// - Updates both `last_char_offset` and `last_byte_offset`
-    pub(crate) fn emit_inner_syntax(
-        &mut self,
-        syntax: &str,
-        byte_start: usize,
-        syntax_type: SyntaxType,
-    ) -> Result<(), fmt::Error> {
-        if syntax.is_empty() {
-            return Ok(());
-        }
-
-        let char_start = self.last_char_offset;
-        let syntax_char_len = syntax.chars().count();
-        let char_end = char_start + syntax_char_len;
-        let byte_end = byte_start + syntax.len();
-
-        let class_str = match syntax_type {
-            SyntaxType::Inline => "md-syntax-inline",
-            SyntaxType::Block => "md-syntax-block",
-        };
-
-        // Generate unique ID for this syntax span
-        let syn_id = self.gen_syn_id();
-
-        write!(
-            &mut self.writer,
-            "<span class=\"{}\" data-syn-id=\"{}\" data-char-start=\"{}\" data-char-end=\"{}\">",
-            class_str, syn_id, char_start, char_end
-        )?;
-        escape_html(&mut self.writer, syntax)?;
-        self.write("</span>")?;
-
-        // Record syntax span info for visibility toggling
-        self.syntax_spans.push(SyntaxSpanInfo {
-            syn_id,
-            char_range: char_start..char_end,
-            syntax_type,
-            formatted_range: None,
-        });
-
-        // Record offset mapping for cursor positioning
-        self.record_mapping(byte_start..byte_end, char_start..char_end);
-
-        self.last_char_offset = char_end;
-        self.last_byte_offset = byte_end;
-
-        Ok(())
-    }
-
-    /// Emit any gap between last position and next offset
-    pub(crate) fn emit_gap_before(&mut self, next_offset: usize) -> Result<(), fmt::Error> {
-        // Skip gap emission if we're inside a table being rendered as markdown
-        if self.table_start_offset.is_some() && self.render_tables_as_markdown {
-            return Ok(());
-        }
-
-        // Skip gap emission if we're buffering code block content
-        // The code block handler manages its own syntax emission
-        if self.code_buffer.is_some() {
-            return Ok(());
-        }
-
-        if next_offset > self.last_byte_offset {
-            self.emit_syntax(self.last_byte_offset..next_offset)?;
-        }
-        Ok(())
-    }
-}
diff --git a/crates/weaver-app/src/components/editor/writer/tags.rs b/crates/weaver-app/src/components/editor/writer/tags.rs
deleted file mode 100644
index 1a38bf5..0000000
--- a/crates/weaver-app/src/components/editor/writer/tags.rs
+++ /dev/null
@@ -1,1509 +0,0 @@
-use core::fmt;
-use std::ops::Range;
-
-use markdown_weaver::{Alignment, BlockQuoteKind, CodeBlockKind, EmbedType, Event, LinkType, Tag};
-use markdown_weaver_escape::{StrWrite, escape_href, escape_html, escape_html_body_text};
-
-use crate::components::editor::{
-    OffsetMapping, SyntaxSpanInfo, SyntaxType,
-    writer::{
-        EditorWriter, TableState,
-        embed::{EmbedContentProvider, ImageResolver},
-        syntax::classify_syntax,
-    },
-};
-
-impl<'a, I: Iterator<Item = (Event<'a>, Range<usize>)>, E: EmbedContentProvider, R: ImageResolver>
-    EditorWriter<'a, I, E, R>
-{
-    /// Detect text direction by scanning source from a byte offset.
-    /// Looks for the first strong directional character.
-    /// Returns Some("rtl") for RTL scripts, Some("ltr") for LTR, None if no strong char found.
-    fn detect_paragraph_direction(&self, start_byte: usize) -> Option<&'static str> {
-        if start_byte >= self.source.len() {
-            return None;
-        }
-
-        // Scan from start_byte through the source looking for first strong directional char
-        let text = &self.source[start_byte..];
-        weaver_renderer::utils::detect_text_direction(text)
-    }
-
-    pub(crate) fn start_tag(
-        &mut self,
-        tag: Tag<'_>,
-        range: Range<usize>,
-    ) -> Result<(), fmt::Error> {
-        // Check if this is a block-level tag that should have syntax inside
-        let is_block_tag = matches!(tag, Tag::Heading { .. } | Tag::BlockQuote(_));
-
-        // For inline tags, emit syntax before tag
-        if !is_block_tag && range.start < range.end {
-            let raw_text = &self.source[range.clone()];
-            let opening_syntax = match &tag {
-                Tag::Strong => {
-                    if raw_text.starts_with("**") {
-                        Some("**")
-                    } else if raw_text.starts_with("__") {
-                        Some("__")
-                    } else {
-                        None
-                    }
-                }
-                Tag::Emphasis => {
-                    if raw_text.starts_with("*") {
-                        Some("*")
-                    } else if raw_text.starts_with("_") {
-                        Some("_")
-                    } else {
-                        None
-                    }
-                }
-                Tag::Strikethrough => {
-                    if raw_text.starts_with("~~") {
-                        Some("~~")
-                    } else {
-                        None
-                    }
-                }
-                Tag::Link { link_type, .. } => {
-                    if matches!(link_type, LinkType::WikiLink { .. }) {
-                        if raw_text.starts_with("[[") {
-                            Some("[[")
-                        } else {
-                            None
-                        }
-                    } else if raw_text.starts_with('[') {
-                        Some("[")
-                    } else {
-                        None
-                    }
-                }
-                // Note: Tag::Image and Tag::Embed handle their own syntax spans
-                // in their respective handlers, so don't emit here
-                _ => None,
-            };
-
-            if let Some(syntax) = opening_syntax {
-                let syntax_type = classify_syntax(syntax);
-                let class = match syntax_type {
-                    SyntaxType::Inline => "md-syntax-inline",
-                    SyntaxType::Block => "md-syntax-block",
-                };
-
-                let char_start = self.last_char_offset;
-                let syntax_char_len = syntax.chars().count();
-                let char_end = char_start + syntax_char_len;
-                let syntax_byte_len = syntax.len();
-
-                // Generate unique ID for this syntax span
-                let syn_id = self.gen_syn_id();
-
-                write!(
-                    &mut self.writer,
-                    "<span class=\"{}\" data-syn-id=\"{}\" data-char-start=\"{}\" data-char-end=\"{}\">",
-                    class, syn_id, char_start, char_end
-                )?;
-                escape_html(&mut self.writer, syntax)?;
-                self.write("</span>")?;
-
-                // Record syntax span info for visibility toggling
-                self.syntax_spans.push(SyntaxSpanInfo {
-                    syn_id: syn_id.clone(),
-                    char_range: char_start..char_end,
-                    syntax_type,
-                    formatted_range: None, // Will be updated when closing tag is emitted
-                });
-
-                // Record offset mapping for cursor positioning
-                // This is critical - without it, current_node_char_offset is wrong
-                // and all subsequent cursor positions are shifted
-                let byte_start = range.start;
-                let byte_end = range.start + syntax_byte_len;
-                self.record_mapping(byte_start..byte_end, char_start..char_end);
-
-                // For paired inline syntax, track opening span for formatted_range
-                if matches!(
-                    tag,
-                    Tag::Strong | Tag::Emphasis | Tag::Strikethrough | Tag::Link { .. }
-                ) {
-                    self.pending_inline_formats.push((syn_id, char_start));
-                }
-
-                // Update tracking - we've consumed this opening syntax
-                self.last_char_offset = char_end;
-                self.last_byte_offset = range.start + syntax_byte_len;
-            }
-        }
-
-        // Emit the opening tag
-        match tag {
-            // HTML blocks get their own paragraph to try and corral them better
-            Tag::HtmlBlock => {
-                // Record paragraph start for boundary tracking
-                // Skip if inside a list or footnote def - they own their paragraph boundary
-                if self.list_depth == 0 && !self.in_footnote_def {
-                    self.current_paragraph_start =
-                        Some((self.last_byte_offset, self.last_char_offset));
-                }
-                let node_id = self.gen_node_id();
-
-                if self.end_newline {
-                    write!(
-                        &mut self.writer,
-                        r#"<p id="{}" class="html-embed html-embed-block">"#,
-                        node_id
-                    )?;
-                } else {
-                    write!(
-                        &mut self.writer,
-                        r#"<p id="{}" class="html-embed html-embed-block">"#,
-                        node_id
-                    )?;
-                }
-                self.begin_node(node_id.clone());
-
-                // Map the start position of the paragraph (before any content)
-                // This allows cursor to be placed at the very beginning
-                let para_start_char = self.last_char_offset;
-                let mapping = OffsetMapping {
-                    byte_range: range.start..range.start,
-                    char_range: para_start_char..para_start_char,
-                    node_id,
-                    char_offset_in_node: 0,
-                    child_index: Some(0), // position before first child
-                    utf16_len: 0,
-                };
-                self.offset_maps.push(mapping);
-
-                Ok(())
-            }
-            Tag::Paragraph(_) => {
-                // Handle wrapper before block
-                self.emit_wrapper_start()?;
-
-                // Record paragraph start for boundary tracking
-                // Skip if inside a list or footnote def - they own their paragraph boundary
-                if self.list_depth == 0 && !self.in_footnote_def {
-                    self.current_paragraph_start =
-                        Some((self.last_byte_offset, self.last_char_offset));
-                }
-
-                let node_id = self.gen_node_id();
-
-                // Detect text direction for this paragraph
-                let dir = self.detect_paragraph_direction(self.last_byte_offset);
-
-                if self.end_newline {
-                    if let Some(dir_value) = dir {
-                        write!(&mut self.writer, "<p id=\"{}\" dir=\"{}\">", node_id, dir_value)?;
-                    } else {
-                        write!(&mut self.writer, "<p id=\"{}\">", node_id)?;
-                    }
-                } else {
-                    if let Some(dir_value) = dir {
-                        write!(&mut self.writer, "<p id=\"{}\" dir=\"{}\">", node_id, dir_value)?;
-                    } else {
-                        write!(&mut self.writer, "<p id=\"{}\">", node_id)?;
-                    }
-                }
-                self.begin_node(node_id.clone());
-
-                // Map the start position of the paragraph (before any content)
-                // This allows cursor to be placed at the very beginning
-                let para_start_char = self.last_char_offset;
-                let mapping = OffsetMapping {
-                    byte_range: range.start..range.start,
-                    char_range: para_start_char..para_start_char,
-                    node_id,
-                    char_offset_in_node: 0,
-                    child_index: Some(0), // position before first child
-                    utf16_len: 0,
-                };
-                self.offset_maps.push(mapping);
-
-                // Emit > syntax if we're inside a blockquote
-                if let Some(bq_range) = self.pending_blockquote_range.take() {
-                    if bq_range.start < bq_range.end {
-                        let raw_text = &self.source[bq_range.clone()];
-                        if let Some(gt_pos) = raw_text.find('>') {
-                            // Extract > [!NOTE] or just >
-                            let after_gt = &raw_text[gt_pos + 1..];
-                            let syntax_end = if after_gt.trim_start().starts_with("[!") {
-                                // Find the closing ]
-                                if let Some(close_bracket) = after_gt.find(']') {
-                                    gt_pos + 1 + close_bracket + 1
-                                } else {
-                                    gt_pos + 1
-                                }
-                            } else {
-                                // Just > and maybe a space
-                                (gt_pos + 1).min(raw_text.len())
-                            };
-
-                            let syntax = &raw_text[gt_pos..syntax_end];
-                            let syntax_byte_start = bq_range.start + gt_pos;
-                            self.emit_inner_syntax(syntax, syntax_byte_start, SyntaxType::Block)?;
-                        }
-                    }
-                }
-                Ok(())
-            }
-            Tag::Heading {
-                level,
-                id,
-                classes,
-                attrs,
-            } => {
-                // Emit wrapper if pending (but don't close on heading end - wraps following block too)
-                self.emit_wrapper_start()?;
-
-                // Record paragraph start for boundary tracking
-                // Treat headings as paragraph-level blocks
-                self.current_paragraph_start = Some((self.last_byte_offset, self.last_char_offset));
-
-                if !self.end_newline {
-                    self.write_newline()?;
-                }
-
-                // Generate node ID for offset tracking
-                let node_id = self.gen_node_id();
-
-                // Detect text direction for this heading
-                let dir = self.detect_paragraph_direction(self.last_byte_offset);
-
-                self.write("<")?;
-                write!(&mut self.writer, "{}", level)?;
-
-                // Add our tracking ID as data attribute (preserve user's id if present)
-                self.write(" data-node-id=\"")?;
-                self.write(&node_id)?;
-                self.write("\"")?;
-
-                if let Some(id) = id {
-                    self.write(" id=\"")?;
-                    escape_html(&mut self.writer, &id)?;
-                    self.write("\"")?;
-                }
-                if !classes.is_empty() {
-                    self.write(" class=\"")?;
-                    for (i, class) in classes.iter().enumerate() {
-                        if i > 0 {
-                            self.write(" ")?;
-                        }
-                        escape_html(&mut self.writer, class)?;
-                    }
-                    self.write("\"")?;
-                }
-
-                // Add dir attribute if text direction was detected
-                if let Some(dir_value) = dir {
-                    self.write(" dir=\"")?;
-                    self.write(dir_value)?;
-                    self.write("\"")?;
-                }
-
-                for (attr, value) in attrs {
-                    self.write(" ")?;
-                    escape_html(&mut self.writer, &attr)?;
-                    if let Some(val) = value {
-                        self.write("=\"")?;
-                        escape_html(&mut self.writer, &val)?;
-                        self.write("\"")?;
-                    } else {
-                        self.write("=\"\"")?;
-                    }
-                }
-                self.write(">")?;
-
-                // Begin node tracking for offset mapping
-                self.begin_node(node_id.clone());
-
-                // Map the start position of the heading (before any content)
-                // This allows cursor to be placed at the very beginning
-                let heading_start_char = self.last_char_offset;
-                let mapping = OffsetMapping {
-                    byte_range: range.start..range.start,
-                    char_range: heading_start_char..heading_start_char,
-                    node_id: node_id.clone(),
-                    char_offset_in_node: 0,
-                    child_index: Some(0), // position before first child
-                    utf16_len: 0,
-                };
-                self.offset_maps.push(mapping);
-
-                // Emit # syntax inside the heading tag
-                if range.start < range.end {
-                    let raw_text = &self.source[range.clone()];
-                    let count = level as usize;
-                    let pattern = "#".repeat(count);
-
-                    // Find where the # actually starts (might have leading whitespace)
-                    if let Some(hash_pos) = raw_text.find(&pattern) {
-                        // Extract "# " or "## " etc
-                        let syntax_end = (hash_pos + count + 1).min(raw_text.len());
-                        let syntax = &raw_text[hash_pos..syntax_end];
-                        let syntax_byte_start = range.start + hash_pos;
-
-                        self.emit_inner_syntax(syntax, syntax_byte_start, SyntaxType::Block)?;
-                    }
-                }
-                Ok(())
-            }
-            Tag::Table(alignments) => {
-                if self.render_tables_as_markdown {
-                    // Store start offset and skip HTML rendering
-                    self.table_start_offset = Some(range.start);
-                    self.in_non_writing_block = true; // Suppress content output
-                    Ok(())
-                } else {
-                    self.emit_wrapper_start()?;
-                    self.table_alignments = alignments;
-                    self.write("<table>")
-                }
-            }
-            Tag::TableHead => {
-                if self.render_tables_as_markdown {
-                    Ok(()) // Skip HTML rendering
-                } else {
-                    self.table_state = TableState::Head;
-                    self.table_cell_index = 0;
-                    self.write("<thead><tr>")
-                }
-            }
-            Tag::TableRow => {
-                if self.render_tables_as_markdown {
-                    Ok(()) // Skip HTML rendering
-                } else {
-                    self.table_cell_index = 0;
-                    self.write("<tr>")
-                }
-            }
-            Tag::TableCell => {
-                if self.render_tables_as_markdown {
-                    Ok(()) // Skip HTML rendering
-                } else {
-                    match self.table_state {
-                        TableState::Head => self.write("<th")?,
-                        TableState::Body => self.write("<td")?,
-                    }
-                    match self.table_alignments.get(self.table_cell_index) {
-                        Some(&Alignment::Left) => self.write(" style=\"text-align: left\">"),
-                        Some(&Alignment::Center) => self.write(" style=\"text-align: center\">"),
-                        Some(&Alignment::Right) => self.write(" style=\"text-align: right\">"),
-                        _ => self.write(">"),
-                    }
-                }
-            }
-            Tag::BlockQuote(kind) => {
-                self.emit_wrapper_start()?;
-
-                let class_str = match kind {
-                    None => "",
-                    Some(BlockQuoteKind::Note) => " class=\"markdown-alert-note\"",
-                    Some(BlockQuoteKind::Tip) => " class=\"markdown-alert-tip\"",
-                    Some(BlockQuoteKind::Important) => " class=\"markdown-alert-important\"",
-                    Some(BlockQuoteKind::Warning) => " class=\"markdown-alert-warning\"",
-                    Some(BlockQuoteKind::Caution) => " class=\"markdown-alert-caution\"",
-                };
-                if self.end_newline {
-                    write!(&mut self.writer, "<blockquote{}>", class_str)?;
-                } else {
-                    write!(&mut self.writer, "<blockquote{}>", class_str)?;
-                }
-
-                // Store range for emitting > inside the next paragraph
-                self.pending_blockquote_range = Some(range);
-                Ok(())
-            }
-            Tag::CodeBlock(info) => {
-                self.emit_wrapper_start()?;
-
-                // Track code block as paragraph-level block
-                self.current_paragraph_start = Some((self.last_byte_offset, self.last_char_offset));
-
-                if !self.end_newline {
-                    self.write_newline()?;
-                }
-
-                // Generate node ID for code block
-                let node_id = self.gen_node_id();
-
-                match info {
-                    CodeBlockKind::Fenced(info) => {
-                        // Emit opening ```language and track both char and byte offsets
-                        if range.start < range.end {
-                            let raw_text = &self.source[range.clone()];
-                            if let Some(fence_pos) = raw_text.find("```") {
-                                let fence_end = (fence_pos + 3 + info.len()).min(raw_text.len());
-                                let syntax = &raw_text[fence_pos..fence_end];
-                                let syntax_char_len = syntax.chars().count() + 1; // +1 for newline
-                                let syntax_byte_len = syntax.len() + 1; // +1 for newline
-
-                                let syn_id = self.gen_syn_id();
-                                let char_start = self.last_char_offset;
-                                let char_end = char_start + syntax_char_len;
-
-                                write!(
-                                    &mut self.writer,
-                                    "<span class=\"md-syntax-block\" data-syn-id=\"{}\" data-char-start=\"{}\" data-char-end=\"{}\" spellcheck=\"false\">",
-                                    syn_id, char_start, char_end
-                                )?;
-                                escape_html(&mut self.writer, syntax)?;
-                                self.write("</span>")?;
-
-                                // Track opening span index for formatted_range update later
-                                self.code_block_opening_span_idx = Some(self.syntax_spans.len());
-                                self.code_block_char_start = Some(char_start);
-
-                                self.syntax_spans.push(SyntaxSpanInfo {
-                                    syn_id,
-                                    char_range: char_start..char_end,
-                                    syntax_type: SyntaxType::Block,
-                                    formatted_range: None, // Will be set in TagEnd::CodeBlock
-                                });
-
-                                self.last_char_offset += syntax_char_len;
-                                self.last_byte_offset = range.start + fence_pos + syntax_byte_len;
-                            }
-                        }
-
-                        let lang = info.split(' ').next().unwrap();
-                        let lang_opt = if lang.is_empty() {
-                            None
-                        } else {
-                            Some(lang.to_string())
-                        };
-                        // Start buffering
-                        self.code_buffer = Some((lang_opt, String::new()));
-
-                        // Begin node tracking for offset mapping
-                        self.begin_node(node_id);
-                        Ok(())
-                    }
-                    CodeBlockKind::Indented => {
-                        // Ignore indented code blocks (as per executive decision)
-                        self.code_buffer = Some((None, String::new()));
-
-                        // Begin node tracking for offset mapping
-                        self.begin_node(node_id);
-                        Ok(())
-                    }
-                }
-            }
-            Tag::List(Some(1)) => {
-                self.emit_wrapper_start()?;
-                // Track list as paragraph-level block
-                self.current_paragraph_start = Some((self.last_byte_offset, self.last_char_offset));
-                self.list_depth += 1;
-                if self.end_newline {
-                    self.write("<ol>")
-                } else {
-                    self.write("<ol>")
-                }
-            }
-            Tag::List(Some(start)) => {
-                self.emit_wrapper_start()?;
-                // Track list as paragraph-level block
-                self.current_paragraph_start = Some((self.last_byte_offset, self.last_char_offset));
-                self.list_depth += 1;
-                if self.end_newline {
-                    self.write("<ol start=\"")?;
-                } else {
-                    self.write("<ol start=\"")?;
-                }
-                write!(&mut self.writer, "{}", start)?;
-                self.write("\">")
-            }
-            Tag::List(None) => {
-                self.emit_wrapper_start()?;
-                // Track list as paragraph-level block
-                self.current_paragraph_start = Some((self.last_byte_offset, self.last_char_offset));
-                self.list_depth += 1;
-                if self.end_newline {
-                    self.write("<ul>")
-                } else {
-                    self.write("<ul>")
-                }
-            }
-            Tag::Item => {
-                // Generate node ID for list item
-                let node_id = self.gen_node_id();
-
-                if self.end_newline {
-                    write!(&mut self.writer, "<li data-node-id=\"{}\">", node_id)?;
-                } else {
-                    write!(&mut self.writer, "<li data-node-id=\"{}\">", node_id)?;
-                }
-
-                // Begin node tracking
-                self.begin_node(node_id);
-
-                // Emit list marker syntax inside the <li> tag and track both offsets
-                if range.start < range.end {
-                    let raw_text = &self.source[range.clone()];
-
-                    // Try to find the list marker (-, *, or digit.)
-                    let trimmed = raw_text.trim_start();
-                    let leading_ws_bytes = raw_text.len() - trimmed.len();
-                    let leading_ws_chars = raw_text.chars().count() - trimmed.chars().count();
-
-                    if let Some(marker) = trimmed.chars().next() {
-                        if marker == '-' || marker == '*' {
-                            // Unordered list: extract "- " or "* "
-                            let marker_end = trimmed
-                                .find(|c: char| c != '-' && c != '*')
-                                .map(|pos| pos + 1)
-                                .unwrap_or(1);
-                            let syntax = &trimmed[..marker_end.min(trimmed.len())];
-                            let char_start = self.last_char_offset;
-                            let syntax_char_len = leading_ws_chars + syntax.chars().count();
-                            let syntax_byte_len = leading_ws_bytes + syntax.len();
-                            let char_end = char_start + syntax_char_len;
-
-                            let syn_id = self.gen_syn_id();
-                            write!(
-                                &mut self.writer,
-                                "<span class=\"md-syntax-block\" data-syn-id=\"{}\" data-char-start=\"{}\" data-char-end=\"{}\" spellcheck=\"false\">",
-                                syn_id, char_start, char_end
-                            )?;
-                            escape_html(&mut self.writer, syntax)?;
-                            self.write("</span>")?;
-
-                            self.syntax_spans.push(SyntaxSpanInfo {
-                                syn_id,
-                                char_range: char_start..char_end,
-                                syntax_type: SyntaxType::Block,
-                                formatted_range: None,
-                            });
-
-                            // Record offset mapping for cursor positioning
-                            self.record_mapping(
-                                range.start..range.start + syntax_byte_len,
-                                char_start..char_end,
-                            );
-                            self.last_char_offset = char_end;
-                            self.last_byte_offset = range.start + syntax_byte_len;
-                        } else if marker.is_ascii_digit() {
-                            // Ordered list: extract "1. " or similar (including trailing space)
-                            if let Some(dot_pos) = trimmed.find('.') {
-                                let syntax_end = (dot_pos + 2).min(trimmed.len());
-                                let syntax = &trimmed[..syntax_end];
-                                let char_start = self.last_char_offset;
-                                let syntax_char_len = leading_ws_chars + syntax.chars().count();
-                                let syntax_byte_len = leading_ws_bytes + syntax.len();
-                                let char_end = char_start + syntax_char_len;
-
-                                let syn_id = self.gen_syn_id();
-                                write!(
-                                    &mut self.writer,
-                                    "<span class=\"md-syntax-block\" data-syn-id=\"{}\" data-char-start=\"{}\" data-char-end=\"{}\" spellcheck=\"false\">",
-                                    syn_id, char_start, char_end
-                                )?;
-                                escape_html(&mut self.writer, syntax)?;
-                                self.write("</span>")?;
-
-                                self.syntax_spans.push(SyntaxSpanInfo {
-                                    syn_id,
-                                    char_range: char_start..char_end,
-                                    syntax_type: SyntaxType::Block,
-                                    formatted_range: None,
-                                });
-
-                                // Record offset mapping for cursor positioning
-                                self.record_mapping(
-                                    range.start..range.start + syntax_byte_len,
-                                    char_start..char_end,
-                                );
-                                self.last_char_offset = char_end;
-                                self.last_byte_offset = range.start + syntax_byte_len;
-                            }
-                        }
-                    }
-                }
-                Ok(())
-            }
-            Tag::DefinitionList => {
-                self.emit_wrapper_start()?;
-                if self.end_newline {
-                    self.write("<dl>")
-                } else {
-                    self.write("<dl>")
-                }
-            }
-            Tag::DefinitionListTitle => {
-                let node_id = self.gen_node_id();
-
-                if self.end_newline {
-                    write!(&mut self.writer, "<dt data-node-id=\"{}\">", node_id)?;
-                } else {
-                    write!(&mut self.writer, "<dt data-node-id=\"{}\">", node_id)?;
-                }
-
-                self.begin_node(node_id);
-                Ok(())
-            }
-            Tag::DefinitionListDefinition => {
-                let node_id = self.gen_node_id();
-
-                if self.end_newline {
-                    write!(&mut self.writer, "<dd data-node-id=\"{}\">", node_id)?;
-                } else {
-                    write!(&mut self.writer, "<dd data-node-id=\"{}\">", node_id)?;
-                }
-
-                self.begin_node(node_id);
-                Ok(())
-            }
-            Tag::Subscript => self.write("<sub>"),
-            Tag::Superscript => self.write("<sup>"),
-            Tag::Emphasis => self.write("<em>"),
-            Tag::Strong => self.write("<strong>"),
-            Tag::Strikethrough => self.write("<s>"),
-            Tag::Link {
-                link_type: LinkType::Email,
-                dest_url,
-                title,
-                ..
-            } => {
-                self.write("<a href=\"mailto:")?;
-                escape_href(&mut self.writer, &dest_url)?;
-                if !title.is_empty() {
-                    self.write("\" title=\"")?;
-                    escape_html(&mut self.writer, &title)?;
-                }
-                self.write("\">")
-            }
-            Tag::Link {
-                link_type,
-                dest_url,
-                title,
-                ..
-            } => {
-                // Collect refs for later resolution
-                let url = dest_url.as_ref();
-                if matches!(link_type, LinkType::WikiLink { .. }) {
-                    let (target, fragment) = weaver_common::EntryIndex::parse_wikilink(url);
-                    self.ref_collector.add_wikilink(target, fragment, None);
-                } else if url.starts_with("at://") {
-                    self.ref_collector.add_at_link(url);
-                }
-
-                // Determine link validity class for wikilinks
-                let validity_class = if matches!(link_type, LinkType::WikiLink { .. }) {
-                    if let Some(index) = &self.entry_index {
-                        if index.resolve(dest_url.as_ref()).is_some() {
-                            " link-valid"
-                        } else {
-                            " link-broken"
-                        }
-                    } else {
-                        ""
-                    }
-                } else {
-                    ""
-                };
-
-                self.write("<a class=\"link")?;
-                self.write(validity_class)?;
-                self.write("\" href=\"")?;
-                escape_href(&mut self.writer, &dest_url)?;
-                if !title.is_empty() {
-                    self.write("\" title=\"")?;
-                    escape_html(&mut self.writer, &title)?;
-                }
-                self.write("\">")
-            }
-            Tag::Image {
-                link_type,
-                dest_url,
-                title,
-                id,
-                attrs,
-            } => {
-                // Check if this is actually an AT embed disguised as a wikilink image
-                // (markdown-weaver parses ![[at://...]] as Image with WikiLink link_type)
-                let url = dest_url.as_ref();
-                if matches!(link_type, LinkType::WikiLink { .. })
-                    && (url.starts_with("at://") || url.starts_with("did:"))
-                {
-                    return self.write_embed(
-                        range,
-                        EmbedType::Other, // AT embeds - disambiguated via NSID later
-                        dest_url,
-                        title,
-                        id,
-                        attrs,
-                    );
-                }
-
-                // Image rendering: all syntax elements share one syn_id for visibility toggling
-                // Structure: ![  alt text  ](url)  <img>  cursor-landing
-                let raw_text = &self.source[range.clone()];
-                let syn_id = self.gen_syn_id();
-                let opening_char_start = self.last_char_offset;
-
-                // Find the alt text and closing syntax positions
-                let paren_pos = raw_text.rfind("](").unwrap_or(raw_text.len());
-                let alt_text = if raw_text.starts_with("![") && paren_pos > 2 {
-                    &raw_text[2..paren_pos]
-                } else {
-                    ""
-                };
-                let closing_syntax = if paren_pos < raw_text.len() {
-                    &raw_text[paren_pos..]
-                } else {
-                    ""
-                };
-
-                // Calculate char positions
-                let alt_char_len = alt_text.chars().count();
-                let closing_char_len = closing_syntax.chars().count();
-                let opening_char_end = opening_char_start + 2; // "!["
-                let alt_char_start = opening_char_end;
-                let alt_char_end = alt_char_start + alt_char_len;
-                let closing_char_start = alt_char_end;
-                let closing_char_end = closing_char_start + closing_char_len;
-                let formatted_range = opening_char_start..closing_char_end;
-
-                // 1. Emit opening ![ syntax span
-                if raw_text.starts_with("![") {
-                    write!(
-                        &mut self.writer,
-                        "<span class=\"md-syntax-inline\" data-syn-id=\"{}\" data-char-start=\"{}\" data-char-end=\"{}\" spellcheck=\"false\">![</span>",
-                        syn_id, opening_char_start, opening_char_end
-                    )?;
-
-                    self.syntax_spans.push(SyntaxSpanInfo {
-                        syn_id: syn_id.clone(),
-                        char_range: opening_char_start..opening_char_end,
-                        syntax_type: SyntaxType::Inline,
-                        formatted_range: Some(formatted_range.clone()),
-                    });
-
-                    // Record offset mapping for ![
-                    self.record_mapping(
-                        range.start..range.start + 2,
-                        opening_char_start..opening_char_end,
-                    );
-                }
-
-                // 2. Emit alt text span (same syn_id, editable when visible)
-                if !alt_text.is_empty() {
-                    write!(
-                        &mut self.writer,
-                        "<span class=\"image-alt\" data-syn-id=\"{}\" data-char-start=\"{}\" data-char-end=\"{}\">",
-                        syn_id, alt_char_start, alt_char_end
-                    )?;
-                    escape_html(&mut self.writer, alt_text)?;
-                    self.write("</span>")?;
-
-                    self.syntax_spans.push(SyntaxSpanInfo {
-                        syn_id: syn_id.clone(),
-                        char_range: alt_char_start..alt_char_end,
-                        syntax_type: SyntaxType::Inline,
-                        formatted_range: Some(formatted_range.clone()),
-                    });
-
-                    // Record offset mapping for alt text
-                    self.record_mapping(
-                        range.start + 2..range.start + 2 + alt_text.len(),
-                        alt_char_start..alt_char_end,
-                    );
-                }
-
-                // 3. Emit closing ](url) syntax span
-                if !closing_syntax.is_empty() {
-                    write!(
-                        &mut self.writer,
-                        "<span class=\"md-syntax-inline\" data-syn-id=\"{}\" data-char-start=\"{}\" data-char-end=\"{}\" spellcheck=\"false\">",
-                        syn_id, closing_char_start, closing_char_end
-                    )?;
-                    escape_html(&mut self.writer, closing_syntax)?;
-                    self.write("</span>")?;
-
-                    self.syntax_spans.push(SyntaxSpanInfo {
-                        syn_id: syn_id.clone(),
-                        char_range: closing_char_start..closing_char_end,
-                        syntax_type: SyntaxType::Inline,
-                        formatted_range: Some(formatted_range.clone()),
-                    });
-
-                    // Record offset mapping for ](url)
-                    self.record_mapping(
-                        range.start + paren_pos..range.end,
-                        closing_char_start..closing_char_end,
-                    );
-                }
-
-                // 4. Emit <img> element (no syn_id - always visible)
-                self.write("<img src=\"")?;
-                let resolved_url = self
-                    .image_resolver
-                    .as_ref()
-                    .and_then(|r| r.resolve_image_url(&dest_url));
-                if let Some(ref cdn_url) = resolved_url {
-                    escape_href(&mut self.writer, cdn_url)?;
-                } else {
-                    escape_href(&mut self.writer, &dest_url)?;
-                }
-                self.write("\" alt=\"")?;
-                escape_html(&mut self.writer, alt_text)?;
-                self.write("\"")?;
-                if !title.is_empty() {
-                    self.write(" title=\"")?;
-                    escape_html(&mut self.writer, &title)?;
-                    self.write("\"")?;
-                }
-                if let Some(attrs) = attrs {
-                    if !attrs.classes.is_empty() {
-                        self.write(" class=\"")?;
-                        for (i, class) in attrs.classes.iter().enumerate() {
-                            if i > 0 {
-                                self.write(" ")?;
-                            }
-                            escape_html(&mut self.writer, class)?;
-                        }
-                        self.write("\"")?;
-                    }
-                    for (attr, value) in &attrs.attrs {
-                        self.write(" ")?;
-                        escape_html(&mut self.writer, attr)?;
-                        self.write("=\"")?;
-                        escape_html(&mut self.writer, value)?;
-                        self.write("\"")?;
-                    }
-                }
-                self.write(" />")?;
-
-                // Consume the text events for alt (they're still in the iterator)
-                // Use consume_until_end() since we already wrote alt text from source
-                self.consume_until_end();
-
-                // Update offsets
-                self.last_char_offset = closing_char_end;
-                self.last_byte_offset = range.end;
-
-                Ok(())
-            }
-            Tag::Embed {
-                embed_type,
-                dest_url,
-                title,
-                id,
-                attrs,
-            } => self.write_embed(range, embed_type, dest_url, title, id, attrs),
-            Tag::WeaverBlock(_, attrs) => {
-                self.in_non_writing_block = true;
-                self.weaver_block_buffer.clear();
-                self.weaver_block_char_start = Some(self.last_char_offset);
-                // Store attrs from Start tag, will merge with parsed text on End
-                if !attrs.classes.is_empty() || !attrs.attrs.is_empty() {
-                    self.pending_block_attrs = Some(attrs.into_static());
-                }
-                Ok(())
-            }
-            Tag::FootnoteDefinition(name) => {
-                // Track as paragraph-level block for incremental rendering
-                self.current_paragraph_start = Some((self.last_byte_offset, self.last_char_offset));
-                // Suppress inner paragraph boundaries (footnote def owns its paragraph)
-                self.in_footnote_def = true;
-
-                if !self.end_newline {
-                    self.write_newline()?;
-                }
-
-                // Generate node ID for cursor tracking
-                let node_id = self.gen_node_id();
-
-                // Emit wrapper div with NEW class (not footnote-definition which has order:9999)
-                // This keeps footnotes in-place instead of reordering to bottom
-                write!(
-                    &mut self.writer,
-                    "<div class=\"footnote-def-editor\" data-node-id=\"{}\">",
-                    node_id
-                )?;
-
-                // Begin node tracking BEFORE emitting prefix
-                self.begin_node(node_id.clone());
-
-                // Map the start position (before any content)
-                let fn_start_char = self.last_char_offset;
-                let mapping = OffsetMapping {
-                    byte_range: range.start..range.start,
-                    char_range: fn_start_char..fn_start_char,
-                    node_id,
-                    char_offset_in_node: 0,
-                    child_index: Some(0),
-                    utf16_len: 0,
-                };
-                self.offset_maps.push(mapping);
-
-                // Extract ACTUAL prefix from source (not constructed string)
-                // This ensures byte offsets match reality
-                let raw_text = &self.source[range.clone()];
-                let prefix_end = raw_text
-                    .find("]:")
-                    .map(|p| {
-                        // Include ]: and any single trailing space
-                        let after_colon = p + 2;
-                        if raw_text.get(after_colon..after_colon + 1) == Some(" ") {
-                            after_colon + 1
-                        } else {
-                            after_colon
-                        }
-                    })
-                    .unwrap_or(0);
-                let prefix = &raw_text[..prefix_end];
-                let prefix_byte_len = prefix.len();
-                let prefix_char_len = prefix.chars().count();
-
-                let char_start = self.last_char_offset;
-                let char_end = char_start + prefix_char_len;
-
-                write!(
-                    &mut self.writer,
-                    "<span class=\"footnote-def-syntax\" data-char-start=\"{}\" data-char-end=\"{}\">",
-                    char_start, char_end
-                )?;
-                escape_html(&mut self.writer, prefix)?;
-                self.write("</span>")?;
-
-                // Store the definition info (no longer tracking syntax spans for hide/show)
-                self.current_footnote_def = Some((name.to_string(), 0, char_start));
-
-                // Record offset mapping for the prefix
-                self.record_mapping(
-                    range.start..range.start + prefix_byte_len,
-                    char_start..char_end,
-                );
-
-                // Update tracking for the prefix
-                self.last_char_offset = char_end;
-                self.last_byte_offset = range.start + prefix_byte_len;
-
-                Ok(())
-            }
-            Tag::MetadataBlock(_) => {
-                self.in_non_writing_block = true;
-                Ok(())
-            }
-        }
-    }
-
-    pub(crate) fn end_tag(
-        &mut self,
-        tag: markdown_weaver::TagEnd,
-        range: Range<usize>,
-    ) -> Result<(), fmt::Error> {
-        use markdown_weaver::TagEnd;
-
-        // Emit tag HTML first
-        let result = match tag {
-            TagEnd::HtmlBlock => {
-                // Capture paragraph boundary info BEFORE writing closing HTML
-                // Skip if inside a list or footnote def - they own their paragraph boundary
-                let para_boundary = if self.list_depth == 0 && !self.in_footnote_def {
-                    self.current_paragraph_start
-                        .take()
-                        .map(|(byte_start, char_start)| {
-                            (
-                                byte_start..self.last_byte_offset,
-                                char_start..self.last_char_offset,
-                            )
-                        })
-                } else {
-                    None
-                };
-
-                // Write closing HTML to current segment
-                self.end_node();
-                self.write("</p>")?;
-
-                // Now finalize paragraph (starts new segment)
-                if let Some((byte_range, char_range)) = para_boundary {
-                    self.finalize_paragraph(byte_range, char_range);
-                }
-                Ok(())
-            }
-            TagEnd::Paragraph(_) => {
-                // Capture paragraph boundary info BEFORE writing closing HTML
-                // Skip if inside a list or footnote def - they own their paragraph boundary
-                let para_boundary = if self.list_depth == 0 && !self.in_footnote_def {
-                    self.current_paragraph_start
-                        .take()
-                        .map(|(byte_start, char_start)| {
-                            (
-                                byte_start..self.last_byte_offset,
-                                char_start..self.last_char_offset,
-                            )
-                        })
-                } else {
-                    None
-                };
-
-                // Write closing HTML to current segment
-                self.end_node();
-                self.write("</p>")?;
-                self.close_wrapper()?;
-
-                // Now finalize paragraph (starts new segment)
-                if let Some((byte_range, char_range)) = para_boundary {
-                    self.finalize_paragraph(byte_range, char_range);
-                }
-                Ok(())
-            }
-            TagEnd::Heading(level) => {
-                // Capture paragraph boundary info BEFORE writing closing HTML
-                let para_boundary =
-                    self.current_paragraph_start
-                        .take()
-                        .map(|(byte_start, char_start)| {
-                            (
-                                byte_start..self.last_byte_offset,
-                                char_start..self.last_char_offset,
-                            )
-                        });
-
-                // Write closing HTML to current segment
-                self.end_node();
-                self.write("</")?;
-                write!(&mut self.writer, "{}", level)?;
-                self.write(">")?;
-                // Note: Don't close wrapper here - headings typically go with following block
-
-                // Now finalize paragraph (starts new segment)
-                if let Some((byte_range, char_range)) = para_boundary {
-                    self.finalize_paragraph(byte_range, char_range);
-                }
-                Ok(())
-            }
-            TagEnd::Table => {
-                if self.render_tables_as_markdown {
-                    // Emit the raw markdown table
-                    if let Some(start) = self.table_start_offset.take() {
-                        let table_text = &self.source[start..range.end];
-                        self.in_non_writing_block = false;
-
-                        // Wrap in a pre or div for styling
-                        self.write("<pre class=\"table-markdown\">")?;
-                        escape_html(&mut self.writer, table_text)?;
-                        self.write("</pre>")?;
-                    }
-                    Ok(())
-                } else {
-                    self.write("</tbody></table>")
-                }
-            }
-            TagEnd::TableHead => {
-                if self.render_tables_as_markdown {
-                    Ok(()) // Skip HTML rendering
-                } else {
-                    self.write("</tr></thead><tbody>")?;
-                    self.table_state = TableState::Body;
-                    Ok(())
-                }
-            }
-            TagEnd::TableRow => {
-                if self.render_tables_as_markdown {
-                    Ok(()) // Skip HTML rendering
-                } else {
-                    self.write("</tr>")
-                }
-            }
-            TagEnd::TableCell => {
-                if self.render_tables_as_markdown {
-                    Ok(()) // Skip HTML rendering
-                } else {
-                    match self.table_state {
-                        TableState::Head => self.write("</th>")?,
-                        TableState::Body => self.write("</td>")?,
-                    }
-                    self.table_cell_index += 1;
-                    Ok(())
-                }
-            }
-            TagEnd::BlockQuote(_) => {
-                // If pending_blockquote_range is still set, the blockquote was empty
-                // (no paragraph inside). Emit the > as its own minimal paragraph.
-                let mut para_boundary = None;
-                if let Some(bq_range) = self.pending_blockquote_range.take() {
-                    if bq_range.start < bq_range.end {
-                        let raw_text = &self.source[bq_range.clone()];
-                        if let Some(gt_pos) = raw_text.find('>') {
-                            let para_byte_start = bq_range.start + gt_pos;
-                            let para_char_start = self.last_char_offset;
-
-                            // Create a minimal paragraph for the empty blockquote
-                            let node_id = self.gen_node_id();
-                            write!(&mut self.writer, "<div id=\"{}\"", node_id)?;
-
-                            // Record start-of-node mapping for cursor positioning
-                            self.offset_maps.push(OffsetMapping {
-                                byte_range: para_byte_start..para_byte_start,
-                                char_range: para_char_start..para_char_start,
-                                node_id: node_id.clone(),
-                                char_offset_in_node: gt_pos,
-                                child_index: Some(0),
-                                utf16_len: 0,
-                            });
-
-                            // Emit the > as block syntax
-                            let syntax = &raw_text[gt_pos..gt_pos + 1];
-                            self.emit_inner_syntax(syntax, para_byte_start, SyntaxType::Block)?;
-
-                            self.write("</div>")?;
-                            self.end_node();
-
-                            // Capture paragraph boundary for later finalization
-                            let byte_range = para_byte_start..bq_range.end;
-                            let char_range = para_char_start..self.last_char_offset;
-                            para_boundary = Some((byte_range, char_range));
-                        }
-                    }
-                }
-                self.write("</blockquote>")?;
-                self.close_wrapper()?;
-
-                // Now finalize paragraph if we had one
-                if let Some((byte_range, char_range)) = para_boundary {
-                    self.finalize_paragraph(byte_range, char_range);
-                }
-                Ok(())
-            }
-            TagEnd::CodeBlock => {
-                use std::sync::LazyLock;
-                use syntect::parsing::SyntaxSet;
-                static SYNTAX_SET: LazyLock<SyntaxSet> =
-                    LazyLock::new(|| SyntaxSet::load_defaults_newlines());
-
-                if let Some((lang, buffer)) = self.code_buffer.take() {
-                    // Create offset mapping for code block content if we tracked ranges
-                    if let (Some(code_byte_range), Some(code_char_range)) = (
-                        self.code_buffer_byte_range.take(),
-                        self.code_buffer_char_range.take(),
-                    ) {
-                        // Record mapping before writing HTML
-                        // (current_node_id should be set by start_tag for CodeBlock)
-                        self.record_mapping(code_byte_range, code_char_range);
-                    }
-
-                    // Get node_id for data-node-id attribute (needed for cursor positioning)
-                    let node_id = self.current_node_id.clone();
-
-                    if let Some(ref lang_str) = lang {
-                        // Use a temporary String buffer for syntect
-                        let mut temp_output = String::new();
-                        match weaver_renderer::code_pretty::highlight(
-                            &SYNTAX_SET,
-                            Some(lang_str),
-                            &buffer,
-                            &mut temp_output,
-                        ) {
-                            Ok(_) => {
-                                // Inject data-node-id into the <pre> tag for cursor positioning
-                                if let Some(ref nid) = node_id {
-                                    let injected = temp_output.replacen(
-                                        "<pre>",
-                                        &format!("<pre data-node-id=\"{}\">", nid),
-                                        1,
-                                    );
-                                    self.write(&injected)?;
-                                } else {
-                                    self.write(&temp_output)?;
-                                }
-                            }
-                            Err(_) => {
-                                // Fallback to plain code block
-                                if let Some(ref nid) = node_id {
-                                    write!(
-                                        &mut self.writer,
-                                        "<pre data-node-id=\"{}\"><code class=\"language-",
-                                        nid
-                                    )?;
-                                } else {
-                                    self.write("<pre><code class=\"language-")?;
-                                }
-                                escape_html(&mut self.writer, lang_str)?;
-                                self.write("\">")?;
-                                escape_html_body_text(&mut self.writer, &buffer)?;
-                                self.write("</code></pre>")?;
-                            }
-                        }
-                    } else {
-                        if let Some(ref nid) = node_id {
-                            write!(&mut self.writer, "<pre data-node-id=\"{}\"><code>", nid)?;
-                        } else {
-                            self.write("<pre><code>")?;
-                        }
-                        escape_html_body_text(&mut self.writer, &buffer)?;
-                        self.write("</code></pre>")?;
-                    }
-
-                    // End node tracking
-                    self.end_node();
-                } else {
-                    self.write("</code></pre>")?;
-                }
-
-                // Emit closing ``` (emit_gap_before is skipped while buffering)
-                // Track the opening span index and char start before we potentially clear them
-                let opening_span_idx = self.code_block_opening_span_idx.take();
-                let code_block_start = self.code_block_char_start.take();
-
-                if range.start < range.end {
-                    let raw_text = &self.source[range.clone()];
-                    if let Some(fence_line) = raw_text.lines().last() {
-                        if fence_line.trim().starts_with("```") {
-                            let fence = fence_line.trim();
-                            let fence_char_len = fence.chars().count();
-
-                            let syn_id = self.gen_syn_id();
-                            let char_start = self.last_char_offset;
-                            let char_end = char_start + fence_char_len;
-
-                            write!(
-                                &mut self.writer,
-                                "<span class=\"md-syntax-block\" data-syn-id=\"{}\" data-char-start=\"{}\" data-char-end=\"{}\" spellcheck=\"false\">",
-                                syn_id, char_start, char_end
-                            )?;
-                            escape_html(&mut self.writer, fence)?;
-                            self.write("</span>")?;
-
-                            self.last_char_offset += fence_char_len;
-                            self.last_byte_offset += fence.len();
-
-                            // Compute formatted_range for entire code block (opening fence to closing fence)
-                            let formatted_range =
-                                code_block_start.map(|start| start..self.last_char_offset);
-
-                            // Update opening fence span with formatted_range
-                            if let (Some(idx), Some(fr)) =
-                                (opening_span_idx, formatted_range.as_ref())
-                            {
-                                if let Some(span) = self.syntax_spans.get_mut(idx) {
-                                    span.formatted_range = Some(fr.clone());
-                                }
-                            }
-
-                            // Push closing fence span with formatted_range
-                            self.syntax_spans.push(SyntaxSpanInfo {
-                                syn_id,
-                                char_range: char_start..char_end,
-                                syntax_type: SyntaxType::Block,
-                                formatted_range,
-                            });
-                        }
-                    }
-                }
-
-                // Finalize code block paragraph
-                if let Some((byte_start, char_start)) = self.current_paragraph_start.take() {
-                    let byte_range = byte_start..self.last_byte_offset;
-                    let char_range = char_start..self.last_char_offset;
-                    self.finalize_paragraph(byte_range, char_range);
-                }
-
-                Ok(())
-            }
-            TagEnd::List(true) => {
-                self.list_depth = self.list_depth.saturating_sub(1);
-                // Capture paragraph boundary BEFORE writing closing HTML
-                let para_boundary =
-                    self.current_paragraph_start
-                        .take()
-                        .map(|(byte_start, char_start)| {
-                            (
-                                byte_start..self.last_byte_offset,
-                                char_start..self.last_char_offset,
-                            )
-                        });
-
-                self.write("</ol>")?;
-                self.close_wrapper()?;
-
-                // Finalize paragraph after closing HTML
-                if let Some((byte_range, char_range)) = para_boundary {
-                    self.finalize_paragraph(byte_range, char_range);
-                }
-                Ok(())
-            }
-            TagEnd::List(false) => {
-                self.list_depth = self.list_depth.saturating_sub(1);
-                // Capture paragraph boundary BEFORE writing closing HTML
-                let para_boundary =
-                    self.current_paragraph_start
-                        .take()
-                        .map(|(byte_start, char_start)| {
-                            (
-                                byte_start..self.last_byte_offset,
-                                char_start..self.last_char_offset,
-                            )
-                        });
-
-                self.write("</ul>")?;
-                self.close_wrapper()?;
-
-                // Finalize paragraph after closing HTML
-                if let Some((byte_range, char_range)) = para_boundary {
-                    self.finalize_paragraph(byte_range, char_range);
-                }
-                Ok(())
-            }
-            TagEnd::Item => {
-                self.end_node();
-                self.write("</li>")
-            }
-            TagEnd::DefinitionList => {
-                self.write("</dl>")?;
-                self.close_wrapper()
-            }
-            TagEnd::DefinitionListTitle => {
-                self.end_node();
-                self.write("</dt>")
-            }
-            TagEnd::DefinitionListDefinition => {
-                self.end_node();
-                self.write("</dd>")
-            }
-            TagEnd::Emphasis => {
-                // Write closing tag FIRST, then emit closing syntax OUTSIDE the tag
-                self.write("</em>")?;
-                self.emit_gap_before(range.end)?;
-                self.finalize_paired_inline_format();
-                Ok(())
-            }
-            TagEnd::Superscript => self.write("</sup>"),
-            TagEnd::Subscript => self.write("</sub>"),
-            TagEnd::Strong => {
-                // Write closing tag FIRST, then emit closing syntax OUTSIDE the tag
-                self.write("</strong>")?;
-                self.emit_gap_before(range.end)?;
-                self.finalize_paired_inline_format();
-                Ok(())
-            }
-            TagEnd::Strikethrough => {
-                // Write closing tag FIRST, then emit closing syntax OUTSIDE the tag
-                self.write("</s>")?;
-                self.emit_gap_before(range.end)?;
-                self.finalize_paired_inline_format();
-                Ok(())
-            }
-            TagEnd::Link => {
-                self.write("</a>")?;
-                // Check if this is a wiki link (ends with ]]) vs regular link (ends with ))
-                let raw_text = &self.source[range.clone()];
-                if raw_text.ends_with("]]") {
-                    // WikiLink: emit ]] as closing syntax
-                    let syn_id = self.gen_syn_id();
-                    let char_start = self.last_char_offset;
-                    let char_end = char_start + 2;
-
-                    write!(
-                        &mut self.writer,
-                        "<span class=\"md-syntax-inline\" data-syn-id=\"{}\" data-char-start=\"{}\" data-char-end=\"{}\" spellcheck=\"false\">]]</span>",
-                        syn_id, char_start, char_end
-                    )?;
-
-                    self.syntax_spans.push(SyntaxSpanInfo {
-                        syn_id,
-                        char_range: char_start..char_end,
-                        syntax_type: SyntaxType::Inline,
-                        formatted_range: None, // Will be set by finalize
-                    });
-
-                    self.last_char_offset = char_end;
-                    self.last_byte_offset = range.end;
-                } else {
-                    self.emit_gap_before(range.end)?;
-                }
-                self.finalize_paired_inline_format();
-                Ok(())
-            }
-            TagEnd::Image => Ok(()), // No-op: raw_text() already consumed the End(Image) event
-            TagEnd::Embed => Ok(()),
-            TagEnd::WeaverBlock(_) => {
-                self.in_non_writing_block = false;
-
-                // Emit the { content } as a hideable syntax span
-                if let Some(char_start) = self.weaver_block_char_start.take() {
-                    // Build the full syntax text: { buffered_content }
-                    let syntax_text = format!("{{{}}}", self.weaver_block_buffer);
-                    let syntax_char_len = syntax_text.chars().count();
-                    let char_end = char_start + syntax_char_len;
-
-                    let syn_id = self.gen_syn_id();
-
-                    write!(
-                        &mut self.writer,
-                        "<span class=\"md-syntax-block\" data-syn-id=\"{}\" data-char-start=\"{}\" data-char-end=\"{}\" spellcheck=\"false\">",
-                        syn_id, char_start, char_end
-                    )?;
-                    escape_html(&mut self.writer, &syntax_text)?;
-                    self.write("</span>")?;
-
-                    // Track the syntax span
-                    self.syntax_spans.push(SyntaxSpanInfo {
-                        syn_id,
-                        char_range: char_start..char_end,
-                        syntax_type: SyntaxType::Block,
-                        formatted_range: None,
-                    });
-
-                    // Record offset mapping for the syntax span
-                    self.record_mapping(range.clone(), char_start..char_end);
-
-                    // Update tracking
-                    self.last_char_offset = char_end;
-                    self.last_byte_offset = range.end;
-                }
-
-                // Parse the buffered text for attrs and store for next block
-                if !self.weaver_block_buffer.is_empty() {
-                    let parsed = Self::parse_weaver_attrs(&self.weaver_block_buffer);
-                    self.weaver_block_buffer.clear();
-                    // Merge with any existing pending attrs or set new
-                    if let Some(ref mut existing) = self.pending_block_attrs {
-                        existing.classes.extend(parsed.classes);
-                        existing.attrs.extend(parsed.attrs);
-                    } else {
-                        self.pending_block_attrs = Some(parsed);
-                    }
-                }
-
-                Ok(())
-            }
-            TagEnd::FootnoteDefinition => {
-                // End node tracking (inner paragraphs may have already cleared it)
-                self.end_node();
-                self.write("</div>")?;
-
-                // Clear footnote tracking
-                self.current_footnote_def.take();
-                self.in_footnote_def = false;
-
-                // Finalize paragraph boundary for incremental rendering
-                if let Some((byte_start, char_start)) = self.current_paragraph_start.take() {
-                    let byte_range = byte_start..self.last_byte_offset;
-                    let char_range = char_start..self.last_char_offset;
-                    self.finalize_paragraph(byte_range, char_range);
-                }
-
-                Ok(())
-            }
-            TagEnd::MetadataBlock(_) => {
-                self.in_non_writing_block = false;
-                Ok(())
-            }
-        };
-
-        result?;
-
-        // Note: Closing syntax for inline formatting tags (Strong, Emphasis, Strikethrough)
-        // is handled INSIDE their respective match arms above, AFTER writing the closing HTML.
-        // This ensures the closing syntax span appears OUTSIDE the formatted element.
-        // Other End events have their closing syntax emitted by emit_gap_before() in the main loop.
-
-        Ok(())
-    }
-}
diff --git a/crates/weaver-editor-core/src/render.rs b/crates/weaver-editor-core/src/render.rs
index 48d3659..46eefb3 100644
--- a/crates/weaver-editor-core/src/render.rs
+++ b/crates/weaver-editor-core/src/render.rs
@@ -7,21 +7,26 @@
 //!
 //! Implementations are provided by the consuming application (e.g., weaver-app).
 
+use markdown_weaver::Tag;
+
 /// Provides HTML content for embedded resources.
 ///
 /// When rendering markdown with embeds (e.g., `![[at://...]]`), this trait
 /// is consulted to get the pre-rendered HTML for the embed.
+///
+/// The full `Tag::Embed` is provided so implementations can access all context:
+/// embed_type, dest_url, title, id, and attrs.
 pub trait EmbedContentProvider {
-    /// Get HTML content for an embed URL.
+    /// Get HTML content for an embed tag.
     ///
     /// Returns `Some(html)` if the embed content is available,
     /// `None` to render a placeholder.
-    fn get_embed_html(&self, url: &str) -> Option<&str>;
+    fn get_embed_content(&self, tag: &Tag<'_>) -> Option<String>;
 }
 
 /// Unit type implementation - no embeds available.
 impl EmbedContentProvider for () {
-    fn get_embed_html(&self, _url: &str) -> Option<&str> {
+    fn get_embed_content(&self, _tag: &Tag<'_>) -> Option<String> {
         None
     }
 }
@@ -63,8 +68,8 @@ impl WikilinkValidator for () {
 /// Reference implementations for common patterns.
 
 impl<T: EmbedContentProvider> EmbedContentProvider for &T {
-    fn get_embed_html(&self, url: &str) -> Option<&str> {
-        (*self).get_embed_html(url)
+    fn get_embed_content(&self, tag: &Tag<'_>) -> Option<String> {
+        (*self).get_embed_content(tag)
     }
 }
 
@@ -81,8 +86,8 @@ impl<T: WikilinkValidator> WikilinkValidator for &T {
 }
 
 impl<T: EmbedContentProvider> EmbedContentProvider for Option<T> {
-    fn get_embed_html(&self, url: &str) -> Option<&str> {
-        self.as_ref().and_then(|p| p.get_embed_html(url))
+    fn get_embed_content(&self, tag: &Tag<'_>) -> Option<String> {
+        self.as_ref().and_then(|p| p.get_embed_content(tag))
     }
 }
 
@@ -98,19 +103,39 @@ impl<T: WikilinkValidator> WikilinkValidator for Option<T> {
     }
 }
 
+/// Implementation for ResolvedContent from weaver-common.
+///
+/// Resolves AT Protocol embeds by looking up the content in the ResolvedContent map.
+impl EmbedContentProvider for weaver_common::ResolvedContent {
+    fn get_embed_content(&self, tag: &Tag<'_>) -> Option<String> {
+        if let Tag::Embed { dest_url, .. } = tag {
+            let url = dest_url.as_ref();
+            if url.starts_with("at://") {
+                if let Ok(at_uri) = jacquard::types::string::AtUri::new(url) {
+                    return weaver_common::ResolvedContent::get_embed_content(self, &at_uri)
+                        .map(|s| s.to_string());
+                }
+            }
+        }
+        None
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
+    use markdown_weaver::EmbedType;
 
     struct TestEmbedProvider;
 
     impl EmbedContentProvider for TestEmbedProvider {
-        fn get_embed_html(&self, url: &str) -> Option<&str> {
-            if url == "at://test/embed" {
-                Some("<div>Test Embed</div>")
-            } else {
-                None
+        fn get_embed_content(&self, tag: &Tag<'_>) -> Option<String> {
+            if let Tag::Embed { dest_url, .. } = tag {
+                if dest_url.as_ref() == "at://test/embed" {
+                    return Some("<div>Test Embed</div>".to_string());
+                }
             }
+            None
         }
     }
 
@@ -136,14 +161,24 @@ mod tests {
         }
     }
 
+    fn make_embed_tag(url: &str) -> Tag<'_> {
+        Tag::Embed {
+            embed_type: EmbedType::Other,
+            dest_url: url.into(),
+            title: "".into(),
+            id: "".into(),
+            attrs: None,
+        }
+    }
+
     #[test]
     fn test_embed_provider() {
         let provider = TestEmbedProvider;
         assert_eq!(
-            provider.get_embed_html("at://test/embed"),
-            Some("<div>Test Embed</div>")
+            provider.get_embed_content(&make_embed_tag("at://test/embed")),
+            Some("<div>Test Embed</div>".to_string())
         );
-        assert_eq!(provider.get_embed_html("at://other"), None);
+        assert_eq!(provider.get_embed_content(&make_embed_tag("at://other")), None);
     }
 
     #[test]
@@ -169,7 +204,7 @@ mod tests {
     #[test]
     fn test_unit_impls() {
         let embed: () = ();
-        assert_eq!(embed.get_embed_html("anything"), None);
+        assert_eq!(embed.get_embed_content(&make_embed_tag("anything")), None);
 
         let image: () = ();
         assert_eq!(image.resolve_image_url("anything"), None);
@@ -182,11 +217,11 @@ mod tests {
     fn test_option_impls() {
         let some_provider: Option<TestEmbedProvider> = Some(TestEmbedProvider);
         assert_eq!(
-            some_provider.get_embed_html("at://test/embed"),
-            Some("<div>Test Embed</div>")
+            some_provider.get_embed_content(&make_embed_tag("at://test/embed")),
+            Some("<div>Test Embed</div>".to_string())
         );
 
         let none_provider: Option<TestEmbedProvider> = None;
-        assert_eq!(none_provider.get_embed_html("at://test/embed"), None);
+        assert_eq!(none_provider.get_embed_content(&make_embed_tag("at://test/embed")), None);
     }
 }
diff --git a/crates/weaver-editor-core/src/text.rs b/crates/weaver-editor-core/src/text.rs
index 36f538b..c2fb2c4 100644
--- a/crates/weaver-editor-core/src/text.rs
+++ b/crates/weaver-editor-core/src/text.rs
@@ -10,7 +10,7 @@ use std::ops::Range;
 /// A text buffer that supports efficient editing and offset conversion.
 ///
 /// All offsets are in Unicode scalar values (chars), not bytes or UTF-16.
-pub trait TextBuffer: Default + Clone {
+pub trait TextBuffer {
     /// Total length in bytes (UTF-8).
     fn len_bytes(&self) -> usize;
 
diff --git a/crates/weaver-editor-core/src/undo.rs b/crates/weaver-editor-core/src/undo.rs
index ce617fb..ef2b005 100644
--- a/crates/weaver-editor-core/src/undo.rs
+++ b/crates/weaver-editor-core/src/undo.rs
@@ -47,15 +47,25 @@ struct EditOperation {
 ///
 /// This is the standard way to get undo support for local editing.
 /// All mutations go through this wrapper, which records them for undo.
-#[derive(Clone)]
-pub struct UndoableBuffer<T: TextBuffer> {
+pub struct UndoableBuffer<T> {
     buffer: T,
     undo_stack: Vec<EditOperation>,
     redo_stack: Vec<EditOperation>,
     max_steps: usize,
 }
 
-impl<T: TextBuffer> Default for UndoableBuffer<T> {
+impl<T: Clone> Clone for UndoableBuffer<T> {
+    fn clone(&self) -> Self {
+        Self {
+            buffer: self.buffer.clone(),
+            undo_stack: self.undo_stack.clone(),
+            redo_stack: self.redo_stack.clone(),
+            max_steps: self.max_steps,
+        }
+    }
+}
+
+impl<T: TextBuffer + Default> Default for UndoableBuffer<T> {
     fn default() -> Self {
         Self::new(T::default(), 100)
     }
diff --git a/crates/weaver-editor-core/src/writer/embed.rs b/crates/weaver-editor-core/src/writer/embed.rs
index 5780bbe..94f6cd4 100644
--- a/crates/weaver-editor-core/src/writer/embed.rs
+++ b/crates/weaver-editor-core/src/writer/embed.rs
@@ -6,7 +6,7 @@ use std::ops::Range;
 
 use jacquard::IntoStatic;
 use jacquard::types::{ident::AtIdentifier, string::Rkey};
-use markdown_weaver::{CowStr, EmbedType, Event};
+use markdown_weaver::{CowStr, Event, Tag};
 use markdown_weaver_escape::{StrWrite, escape_html};
 use smol_str::SmolStr;
 
@@ -65,8 +65,10 @@ impl EditorImageResolver {
         blob_rkey: Rkey<'static>,
         ident: AtIdentifier<'static>,
     ) {
-        self.images
-            .insert(SmolStr::new(name), ResolvedImage::Draft { blob_rkey, ident });
+        self.images.insert(
+            SmolStr::new(name),
+            ResolvedImage::Draft { blob_rkey, ident },
+        );
     }
 
     /// Add an already-uploaded draft image.
@@ -160,8 +162,9 @@ impl ImageResolver for EditorImageResolver {
 }
 
 // write_embed implementation
-impl<'a, I, E, R, W> EditorWriter<'a, I, E, R, W>
+impl<'a, T, I, E, R, W> EditorWriter<'a, T, I, E, R, W>
 where
+    T: crate::TextBuffer,
     I: Iterator<Item = (Event<'a>, Range<usize>)>,
     E: EmbedContentProvider,
     R: ImageResolver,
@@ -170,12 +173,18 @@ where
     pub(crate) fn write_embed(
         &mut self,
         range: Range<usize>,
-        _embed_type: EmbedType,
-        dest_url: CowStr<'_>,
-        title: CowStr<'_>,
-        _id: CowStr<'_>,
-        attrs: Option<markdown_weaver::WeaverAttributes<'_>>,
+        tag: Tag<'_>,
     ) -> Result<(), fmt::Error> {
+        let Tag::Embed {
+            dest_url,
+            title,
+            attrs,
+            ..
+        } = &tag
+        else {
+            return Ok(());
+        };
+
         // Embed rendering: all syntax elements share one syn_id for visibility toggling
         // Structure: ![[  url-as-link  ]]  <embed-content>
         let raw_text = &self.source[range.clone()];
@@ -279,7 +288,7 @@ where
 
         // 4. Emit the actual embed content
         // Try to get content from attributes first
-        let content_from_attrs = if let Some(ref attrs) = attrs {
+        let content_from_attrs = if let Some(attrs) = attrs {
             attrs
                 .attrs
                 .iter()
@@ -290,12 +299,10 @@ where
         };
 
         // If no content in attrs, try provider
-        // Convert to owned to avoid borrow checker issues with self.write()
-        // TODO: figure out a way to do this that doesn't involve cloning
         let content: Option<String> = if content_from_attrs.is_some() {
             content_from_attrs
         } else if let Some(ref provider) = self.embed_provider {
-            provider.get_embed_html(url).map(|s| s.to_string())
+            provider.get_embed_content(&tag)
         } else {
             None
         };
diff --git a/crates/weaver-editor-core/src/writer/events.rs b/crates/weaver-editor-core/src/writer/events.rs
index 56f20b9..162400f 100644
--- a/crates/weaver-editor-core/src/writer/events.rs
+++ b/crates/weaver-editor-core/src/writer/events.rs
@@ -14,8 +14,9 @@ use crate::syntax::{SyntaxSpanInfo, SyntaxType};
 use super::{EditorWriter, WriterResult};
 
 // Main run loop
-impl<'a, I, E, R, W> EditorWriter<'a, I, E, R, W>
+impl<'a, T, I, E, R, W> EditorWriter<'a, T, I, E, R, W>
 where
+    T: crate::TextBuffer,
     I: Iterator<Item = (Event<'a>, Range<usize>)>,
     E: EmbedContentProvider,
     R: ImageResolver,
@@ -84,7 +85,7 @@ where
         // Handle unmapped trailing content (stripped by parser)
         // This includes trailing spaces that markdown ignores
         let doc_byte_len = self.source.len();
-        let doc_char_len = self.source_len_chars;
+        let doc_char_len = self.text_buffer.len_chars();
 
         if self.last_byte_offset < doc_byte_len || self.last_char_offset < doc_char_len {
             // Emit the trailing content as visible syntax
diff --git a/crates/weaver-editor-core/src/writer/mod.rs b/crates/weaver-editor-core/src/writer/mod.rs
index f487c08..e6b8afa 100644
--- a/crates/weaver-editor-core/src/writer/mod.rs
+++ b/crates/weaver-editor-core/src/writer/mod.rs
@@ -94,17 +94,19 @@ impl markdown_weaver_escape::StrWrite for SegmentedWriter {
 /// HTML writer that preserves markdown formatting characters.
 ///
 /// Generic over:
+/// - `T`: Text buffer for efficient offset conversions
 /// - `I`: Iterator of markdown events with byte ranges
 /// - `E`: Embed content provider (optional)
 /// - `R`: Image resolver (optional)
 /// - `W`: Wikilink validator (optional)
-pub struct EditorWriter<'a, I, E = (), R = (), W = ()>
+pub struct EditorWriter<'a, T, I, E = (), R = (), W = ()>
 where
+    T: crate::TextBuffer,
     I: Iterator<Item = (Event<'a>, Range<usize>)>,
 {
     // === Input ===
     source: &'a str,
-    source_len_chars: usize,
+    text_buffer: &'a T,
     events: I,
 
     // === Output ===
@@ -146,19 +148,20 @@ where
     ref_collector: weaver_common::RefCollector,
 }
 
-impl<'a, I, E, R, W> EditorWriter<'a, I, E, R, W>
+impl<'a, T, I, E, R, W> EditorWriter<'a, T, I, E, R, W>
 where
+    T: crate::TextBuffer,
     I: Iterator<Item = (Event<'a>, Range<usize>)>,
 {
     /// Create a new EditorWriter.
     ///
-    /// `source` is the markdown source text.
-    /// `source_len_chars` is the length in Unicode chars (for bounds checking).
+    /// `source` is the markdown source text (should match text_buffer content).
+    /// `text_buffer` provides efficient offset conversions.
     /// `events` is the markdown parser event iterator.
-    pub fn new(source: &'a str, source_len_chars: usize, events: I) -> Self {
+    pub fn new(source: &'a str, text_buffer: &'a T, events: I) -> Self {
         Self {
             source,
-            source_len_chars,
+            text_buffer,
             events,
             writer: SegmentedWriter::new(),
             last_byte_offset: 0,
@@ -232,10 +235,10 @@ where
     pub fn with_embed_provider<E2: EmbedContentProvider>(
         self,
         provider: E2,
-    ) -> EditorWriter<'a, I, E2, R, W> {
+    ) -> EditorWriter<'a, T, I, E2, R, W> {
         EditorWriter {
             source: self.source,
-            source_len_chars: self.source_len_chars,
+            text_buffer: self.text_buffer,
             events: self.events,
             writer: self.writer,
             last_byte_offset: self.last_byte_offset,
@@ -268,10 +271,10 @@ where
     pub fn with_image_resolver<R2: ImageResolver>(
         self,
         resolver: R2,
-    ) -> EditorWriter<'a, I, E, R2, W> {
+    ) -> EditorWriter<'a, T, I, E, R2, W> {
         EditorWriter {
             source: self.source,
-            source_len_chars: self.source_len_chars,
+            text_buffer: self.text_buffer,
             events: self.events,
             writer: self.writer,
             last_byte_offset: self.last_byte_offset,
@@ -304,10 +307,10 @@ where
     pub fn with_wikilink_validator<W2: WikilinkValidator>(
         self,
         validator: W2,
-    ) -> EditorWriter<'a, I, E, R, W2> {
+    ) -> EditorWriter<'a, T, I, E, R, W2> {
         EditorWriter {
             source: self.source,
-            source_len_chars: self.source_len_chars,
+            text_buffer: self.text_buffer,
             events: self.events,
             writer: self.writer,
             last_byte_offset: self.last_byte_offset,
@@ -344,8 +347,9 @@ where
 }
 
 // Core helper methods
-impl<'a, I, E, R, W> EditorWriter<'a, I, E, R, W>
+impl<'a, T, I, E, R, W> EditorWriter<'a, T, I, E, R, W>
 where
+    T: crate::TextBuffer,
     I: Iterator<Item = (Event<'a>, Range<usize>)>,
 {
     /// Write a string to the output.
diff --git a/crates/weaver-editor-core/src/writer/syntax.rs b/crates/weaver-editor-core/src/writer/syntax.rs
index f1de835..be68885 100644
--- a/crates/weaver-editor-core/src/writer/syntax.rs
+++ b/crates/weaver-editor-core/src/writer/syntax.rs
@@ -11,8 +11,9 @@ use crate::syntax::{SyntaxSpanInfo, SyntaxType, classify_syntax};
 
 use super::EditorWriter;
 
-impl<'a, I, E, R, W> EditorWriter<'a, I, E, R, W>
+impl<'a, T, I, E, R, W> EditorWriter<'a, T, I, E, R, W>
 where
+    T: crate::TextBuffer,
     I: Iterator<Item = (Event<'a>, Range<usize>)>,
     E: EmbedContentProvider,
     R: ImageResolver,
diff --git a/crates/weaver-editor-core/src/writer/tags.rs b/crates/weaver-editor-core/src/writer/tags.rs
index d426740..8b81f2b 100644
--- a/crates/weaver-editor-core/src/writer/tags.rs
+++ b/crates/weaver-editor-core/src/writer/tags.rs
@@ -13,8 +13,9 @@ use crate::syntax::{SyntaxSpanInfo, SyntaxType, classify_syntax};
 
 use super::{EditorWriter, TableState};
 
-impl<'a, I, E, R, W> EditorWriter<'a, I, E, R, W>
+impl<'a, T, I, E, R, W> EditorWriter<'a, T, I, E, R, W>
 where
+    T: crate::TextBuffer,
     I: Iterator<Item = (Event<'a>, Range<usize>)>,
     E: EmbedContentProvider,
     R: ImageResolver,
@@ -747,14 +748,15 @@ where
                 if matches!(link_type, LinkType::WikiLink { .. })
                     && (url.starts_with("at://") || url.starts_with("did:"))
                 {
-                    return self.write_embed(
-                        range,
-                        EmbedType::Other, // AT embeds - disambiguated via NSID later
+                    // Construct an Embed tag from the Image fields
+                    let embed_tag = Tag::Embed {
+                        embed_type: EmbedType::Other,
                         dest_url,
                         title,
                         id,
                         attrs,
-                    );
+                    };
+                    return self.write_embed(range, embed_tag);
                 }
 
                 // Image rendering: all syntax elements share one syn_id for visibility toggling
@@ -906,13 +908,7 @@ where
 
                 Ok(())
             }
-            Tag::Embed {
-                embed_type,
-                dest_url,
-                title,
-                id,
-                attrs,
-            } => self.write_embed(range, embed_type, dest_url, title, id, attrs),
+            tag @ Tag::Embed { .. } => self.write_embed(range, tag),
             Tag::WeaverBlock(_, attrs) => {
                 self.in_non_writing_block = true;
                 self.weaver_block.buffer.clear();