home: a default video can be the node's front door. Branding key defaultVideo (a video's at:// URI, or its page path <handle-or-did>/video/<rkey>) makes the front page that video's page while set, over defaultStreamer: the replay to send everyone to after an event, and clearing it returns the front page to the streamer. The front page's 15-second poll now watches both keys and reloads when either changes, so viewers on the stream page move to the replay within 15 seconds of the operator setting it, and back when it is cleared (an unset vocabulary key reads as empty; a key outside the vocabulary is now a 404 rather than a 500). A Default video block in the branding admin, beside Default Streamer