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Desktop mode's focus gating (from #49) made losing OS focus send "leave" for every open room, which stopped live message delivery to that room, not just notification eligibility -- so a message wouldn't render until the room was manually left and rejoined. Room join/leave is now gated on visibility alone, matching the browser; notification eligibility gets its own separate signal (a "focus"/"blur" WS frame tracked by a new Redis-backed FocusPresence), so a connected-but-unfocused desktop member still gets notified without losing live delivery. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>