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Typing `@` in the compose box opens a dropdown of matching mesh members fed by /v1/members. Filters live by displayName prefix (case-insensitive); online members rank above offline; shorter names rank higher; capped at 8 entries. Keyboard: ArrowUp/Down to navigate, Enter or Tab to insert, Escape to dismiss. Mouse hover updates the selection; mousedown inserts (mousedown so the textarea doesn't lose focus first). Rendered messages now highlight @mentions in clay so they're visually distinct from plain text — same regex the autocomplete uses, so the round trip is consistent. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>