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@username tokens in a sent message are parsed against the room's actual members (skipping fenced/inline code, so pasted code isn't misread) and recorded as MessageMention rows, reusing #38's read-tracking and offline-member broadcast infrastructure rather than building a parallel notification path: - Sidebar: a mentioned-and-unread room shows a distinct highlight- colored badge instead of (not alongside) the plain unread dot -- computed the same way as has_unread, just scoped to messages that mention the caller, and cleared by the same last_read_at mark-read flow. - Push notifications: a mentioned offline recipient gets "X mentioned you: ..." instead of the generic "X: ...", still per-recipient since the same message can page some room members and not others. - Message rendering: a validated @username is highlighted inline, implemented by turning it into a `[@username](mention:username)` link before markdown parsing and overriding link rendering to style `mention:`-scheme links as a span instead of an anchor -- reuses markdown-to-jsx's existing parser rather than hand-rolling text-node splitting. - Composer: typing @ opens an autocomplete dropdown of matching room members (arrow keys to navigate, Enter/Tab/click to insert, Escape or moving the cursor away to dismiss). Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>