Phase 3 (EPUB half) of the reader redesign:
- Select text in a reflowable book → floating glass popover at the
selection (5 colors, note, copy). Clicking a color creates the
highlight via POST /api/media-items/:id/highlights, anchored by the
foliate range CFI (epubcfi_start) with percentage position.
- Highlights render through foliate's overlayer pipeline: draw-
annotation draws Overlayer.highlight with the stored color,
create-overlay re-adds persisted highlights as sections load,
show-annotation opens the edit popover when a highlight is clicked
(recolor, edit note, copy, delete).
- Backend: highlight create/update accept epubcfi_start/end,
note_text, and percentage fields; position validation relaxed
(CFIs exceed the old 100-char cap); PUT routes through
AnnotationService.SaveHighlight so edits get dedup/LWW treatment
and actually persist note_text (the plain query can't).
- Bookmarks drawer becomes the Annotations drawer with tabs:
Highlights (color-bar list, note previews, jump/edit/delete),
Notes (add note at current position, list, delete — backed by the
existing notes API), and Bookmarks (unchanged behavior).
- Popover dismissed on outside click, collapsed selection, page
navigation, or Esc (new top-priority Esc branch).