* feat: add empty state hints and loading indicators for annotations, bookmarks, notes, font import, and Moon+ Reader import
- BooknoteView: show 'No annotation yet' / 'No bookmark yet' when empty
- Notebook: show 'No note yet' when no notes/excerpts exist
- Annotator: add loading overlay with spinner during Moon+ Reader import
- mrexpt: yield to event loop every 5 entries to keep spinner animating
- CustomFonts: show in-place loading card during font import, spinner transitions to font name without layout jump
* fix(ui): respect e-ink overlay styling and drop dead className branch
- Annotator: use modal-box on the mrexpt import overlay so eink picks up
the no-shadow + 1px border override automatically.
- CustomFonts: collapse importing-card clsx ternary whose branches were
identical into a flat className.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
---------
Co-authored-by: Huang Xin <chrox.huang@gmail.com>
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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