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Users can right-click any room and 'Rename for me...' to set a local display name visible only to them. Stored in account data under io.lotus.room_names. Shows a pencil indicator on renamed rooms. useLocalRoomName() hook overrides useRoomName() when a local name exists. Also includes: - Rich room topic rendering via RoomTopicContent object (formatted_body support in RoomTopicViewer with HTML sanitization via sanitizeCustomHtml) - Edit history viewer: clicking '(edited)' on a message opens a modal showing all prior versions with timestamps (EditHistoryModal.tsx) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>