Groups an already-alphabetical library into per-letter sections (accents
folded, so an item is bucketed under its base letter) with a sticky
heading before each - still one chunked-rendered grid, not a big
synchronous write, so a 1000+-item library stays smooth. The right-edge
rail jumps to a letter on tap or drag (pointer-capture, same shape as
the mobile nav sheet's own drag handle), dims letters with nothing in
them, and tracks the header/music-bar's real height instead of a
guessed offset so it never sits under either.
Stacked on feature/library-sticky-header (Library.css's .libraryHeader,
not yet merged) rather than master, per CLAUDE.md's sequential-PRs rule.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Nicolas
0bd95b03b9