fix(reader): stabilize chrome panels, bookmarks end-to-end, dead UI removal

Phase 0 of the reader redesign:

- Panels no longer render under the top/bottom bars: sidebars get
  measured insets (same resize/safe-area mechanism as the viewport);
  panel max-height now derives from the bounded sidebar instead of a
  100vh guess; right-side border targets the actual sidebar.
- Bookmarks work end-to-end for the first time: REST CRUD under
  /api/media-items/:id/bookmarks (create/delete route through
  AnnotationService for dedup/LWW/tombstones), fix UpdateMediaBookmark
  referencing nonexistent updated_at column, frontend posts to the
  real API with per-format position (CFI vs page), live list with
  jump + delete instead of SSR-only snapshot.
- Fix chapter matching in progress saves: boundaries were compared by
  a nonexistent tocItem property, so chapter was never persisted.
- Remove dead UI: Navigator panel stub, empty dictionary popup shell,
  unwired Chrome Behavior select; purge 160 stale build artifacts.
- Reader chrome now follows the user's app theme instead of hardcoded
  theme-tokyo-night.

internal/database/models.go

@@ -1,6 +1,6 @@
 // Code generated by sqlc. DO NOT EDIT.
 // versions:
-//   sqlc v1.31.1
+//   sqlc v1.30.0
 
 package database