Full-screen community selection interface for post creation:
- Search with debounced client-side filtering
- Infinite scroll pagination
- Cached avatar images with error fallback
- Proper authenticated API service with disposal
- Member/subscriber count formatting (K/M suffixes)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Add CovesApiService methods for community operations:
- listCommunities(): Fetch communities with pagination and sorting
- createPost(): Create posts with title, content, embeds, and labels

Both methods include proper error handling and debug logging.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Add data models for community-related API operations:
- CommunitiesResponse and CommunityView for listing communities
- CommunityViewerState for subscription/membership status
- CreatePostRequest and CreatePostResponse for post creation
- ExternalEmbedInput for link embeds
- SelfLabels and SelfLabel for content labels (NSFW, etc.)

All models support const constructors for better performance.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Add per-post CommentsProvider caching with LRU eviction for instant
back-navigation, scroll position restoration, and draft text preservation.

Updates feed tests to reflect the new feed type tab behavior:
- Default feed is now Discover (not timeline)
- Authenticated users see both Discover and For You tabs
- Unauthenticated users see only Discover tab
- Updated test descriptions for clarity

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Updates tests to work with the new CommentsProvider constructor that
requires postUri and postCid parameters.

Changes:
- CommentsProvider tests: pass postUri/postCid in constructor, remove
parameters from loadComments calls
- Add MockCommentsProvider helper for widget tests
- Update FocusedThreadScreen tests to provide commentsProvider parameter

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Updates PostDetailScreen, ReplyScreen, and FocusedThreadScreen to use
the new CommentsProviderCache for instant back-navigation and state preservation.

PostDetailScreen:
- Acquires provider from cache with reference counting
- Restores scroll position when returning to cached comments
- Background refresh if data is stale (>5 min)
- Handles sign-out by navigating back to feed

ReplyScreen:
- Requires CommentsProvider parameter for draft access
- Saves draft text on cancel, restores on reopen
- Per-parent-URI drafts (separate drafts for different reply contexts)
- Auto-closes on sign-out

FocusedThreadScreen:
- Passes CommentsProvider to children for consistent draft/vote state

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>