- Update mock providers to remove VoteService dependency
- Add ViewerState to test fixtures for feed and comments
- Update FeedProvider tests for vote state initialization
- Update CommentsProvider tests for recursive vote state init
- Update VoteProvider tests for extractRkeyFromUri utility
- Remove obsolete vote service test methods (deleteVote, getUserVotes)
- Add generated mock files for auth service tests

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

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

main.dart:
- Remove voteService parameter from FeedProvider and CommentsProvider

CommentsProvider:
- Remove VoteService dependency - vote state from response viewer data
- Add _initializeCommentVoteState helper for recursive vote initialization
- On refresh: initialize all comments (server data is truth)
- On pagination: only initialize new comments (preserve optimistic state)

This completes the migration from VoteService.getUserVotes() to using
viewer state from API responses for both feed posts and comments.

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

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

- Remove VoteService dependency - vote state comes from feed response
- Replace getUserVotes + loadInitialVotes with per-post setInitialVoteState
- Use viewer.vote and viewer.voteUri from backend response
- Call setInitialVoteState for ALL posts to handle cross-device vote removal

This fixes the bug where votes would disappear on feed refresh:
1. Backend now populates viewer state from PDS cache
2. Feed provider initializes VoteProvider state from viewer data
3. Score adjustments are cleared to prevent double-counting

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

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

Vote Service:
- Remove deleteVote method - backend handles toggle logic
- Remove getUserVotes - vote state now comes from feed viewer data
- Remove unused ExistingVote and VoteInfo classes
- Handle empty uri/cid response as successful toggle-off
- Use shared extractRkeyFromUri utility

Vote Provider:
- Remove existingVoteRkey/Direction params from createVote call
- Remove loadInitialVotes - replaced by setInitialVoteState per-post
- Add extractRkeyFromUri static utility to VoteState
- Clear score adjustments in setInitialVoteState to prevent double-counting

This aligns with the backend's vote cache approach where viewer state
is populated from PDS on each request rather than relying on the
eventually-consistent AppView index.

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

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

Add ViewerState class to represent the viewer's relationship with posts:
- vote: direction ("up", "down", or null)
- voteUri: AT-URI of the vote record
- saved: bookmark status
- tags: user-applied tags

This enables the feed to include viewer-specific state from the backend,
allowing proper initialization of vote UI state on feed refresh.

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

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

Major OAuth architecture rework - delegate complexity to backend.

Key changes:
- Add CovesSession model for simplified sealed tokens
- Add CovesAuthService for backend-delegated OAuth
- Update OAuth config for private-use URI scheme (RFC 8252)
- Add automatic token refresh on 401 responses
- Remove atproto_oauth_flutter package (~14K lines)

The backend now handles all OAuth complexity (DPoP, PKCE, token exchange)
and returns opaque sealed tokens that the client simply stores and sends.

- Remove unused imports in test files
- Add assertion on unused variable in singleton test
- Clean up redaction test file (remove unused mocks)

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

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