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A11y: - Add aria-label Close to RoomTopicViewer, ImagePackView close buttons - Add aria-label Cancel to LeaveRoomPrompt cancel button - Add aria-label to Send, Reply, Thread, Edit, React, Search, Mute, Download buttons - Fix aria-pressed -> aria-expanded + aria-haspopup on menu anchor triggers - Add aria-label to username/password auth inputs BUG-21: Add useAlive unmount guard to handleGifSelect error path in RoomInput BUG-22: Fix typing status timer accumulation with typingTimerRef Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>