- Exclude CLAUDE.md from sync (move to .claude/ dotfile dir, clean up root copy)
- Add Ctrl+wheel font zoom for editor (capture phase, disable Electron built-in zoom)
- Load cached PDF on project connect (avoid recompile to see last PDF)
- Add synctex debug logging for PDF↔source navigation troubleshooting
- Fix .claude/ dir creation order (mkdir before write)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

The root cause of server compile failures was that output.pdf was being
saved into the synced project directory, causing FileSyncBridge to upload
it back to Overleaf as a project file. CLSI then failed because it found
an existing output.pdf blocking its compilation output.

Changes:
- Save compile artifacts (PDF, synctex.gz) to .build/ subdirectory instead
  of the synced project root — .build is a dotfile dir ignored by chokidar
- Add pdf/pdfxref/stderr/stdout/chktex to FileSyncBridge ignore patterns
- Add rootResourcePath to compile request body (matches Overleaf web client)
- Implement PDF download with fallback via direct build ID URL construction
- Add server compile handler, compile dropdown menu, PDF save button
- Fix resolved comment highlight flash on startup (null initial state)
- Fix EPIPE crash on startup when stdout/stderr is closed
- Fix synctex inverse search to use relative paths via OT doc join

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

- Sync new local files (created by Claude Code etc.) to Overleaf via REST API
- Create intermediate folders as needed, handle both text docs and binaries
- Scan for orphaned files on startup that weren't synced previously
- Add "Copy Comments" quick action: copies unresolved comments for current file
  to clipboard with line numbers, context, author names, and timestamps
- Filter comments to active file only, exclude resolved threads

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Root cause: SHA-1 hash sent with applyOtUpdate didn't match Overleaf's
server-side computation, causing "Invalid hash" error, disconnect, and
rollback of all synced changes.

- Remove hash field from applyOtUpdate to skip server-side hash check
- Switch applyOtUpdate from fire-and-forget to emitWithAck for reliable ack
- Fix getOldDoc bug: save base doc when changes start accumulating instead
  of incorrectly using current doc (caused wrong delete ops)
- Fix ack handler: only ack when no 'op' field (was acking remote ops too)
- Await fileSyncBridge.start() instead of fire-and-forget
- Add joinDoc retry logic for transient joinLeaveEpoch mismatch errors
- Clear pending ack callbacks on WebSocket close to prevent timeout errors
- Add otUpdateError logging for server-side rejections
- Add file-based bridge logging for debugging sync issues

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

chokidar FSEvents is unreliable in macOS temp dirs and misses atomic
writes (write temp + rename) used by Claude Code and other editors.
Switch to usePolling with 500ms interval and atomic: true.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

FileSyncBridge now handles binary fileRefs in addition to text docs:
- Downloads all binary files to temp dir on project connect
- Watches for binary file changes on disk and uploads via REST API
- Listens for Overleaf socket events (reciveNewFile, reciveNewDoc,
  removeEntity, reciveEntityRename) to sync remote changes to disk
- Tracks binary files by SHA1 hash to avoid redundant uploads

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Implement full Overleaf integration with Socket.IO v0.9 real-time sync:
- FileSyncBridge for bidirectional temp dir ↔ Overleaf sync via chokidar + diff-match-patch
- OT state machine, transform functions, and CM6 adapter for collaborative editing
- Comment system with highlights, tooltips, and review panel
- Project list, file tree management, and socket-based compilation
- 3-layer loop prevention (write guards, content equality, debounce)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>