Perf-3: Replace raw roomToUnreadAtom subscription in Home, Direct, Space with
selectAtom-derived Set<string> — components now only re-render when rooms
gain/lose unread presence, not on every notification count update
Perf-5: RoomTimeline eventRenderer now uses binary search on precomputed
timelineSegments instead of O(N×T) linear scan per visible message
A11y L-1: Add as=h2 semantic heading to Home, Direct, Inbox, Space page nav
titles so screen readers announce page sections correctly
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Lotus BotandClaude Sonnet 4.6
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