Rewrite FeedScreen from inline EventCollectionState + 8 rememberSubscription()
calls to cache-centric DesktopFeedViewModel pattern:
- ViewModel keyed on feedMode with DisposableEffect cleanup (destroy())
- FeedState pattern matching (Loading/Loaded/Empty/Error)
- FeedNoteCard takes Note instead of Event, reads counts from Note.flowSet
- DisposableEffect for note.clearFlow() cleanup in LazyColumn
- DisposableEffect for Coordinator interaction subscription lifecycle
- LaunchedEffect for rate-limited metadata loading via Coordinator
- Extract FeedHeader into separate composable
- Add destroy() to DesktopFeedViewModel (ViewModel.clear() is internal in KMP)
- Update UserProfileScreen to look up Note from cache for FeedNoteCard
Removes ~350 lines of inline state management (EventCollectionState,
zapsByEvent, reactionIdsByEvent, replyIdsByEvent, repostIdsByEvent,
followedUsers, bookmarkList, 8 rememberSubscription blocks).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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