The app's HTML template links /favicon.png first (Expo's web export writes that tag) and /favicon.ico second; only the .ico route went through branding, so browsers and link unfurlers (Slack takes the first icon link) kept showing the bundled brand mark beside a fully branded card. One handler behind both routes: the branded blob with its own MIME type, else the bundled file; Cache-Control max-age=300 so a rebrand shows within minutes Claude-Session: https://claude.ai/code/session_014aPQ5yqG9QFxKnbwQfCYKa (cherry picked from commit d4f4ccd886f98a392b20965ac0fafbc7c4889347)