- bookmark button 🔖 in toolbar (Ctrl+B / Cmd+B shortcut)
- addBookmark() saves current position (CFI for epub, page for pdf, scroll% for text)
- bookmarks stored in localStorage per-file (bookish_bookmarks_<filename>)
- sidebar Segnalibri tab shows clickable list with delete button
- gotoBookmark() restores the exact position per format type
- CSS styles for bm-entry, bm-label, bm-time, bm-delete
Original SVG at 512x512 had strokes 2-3px → at 28px (navbar)
and 16px (favicon) became ~0.1px, invisible. Simplified to
64x64 with chunky shapes and 2.5px strokes.
truetype