- backend/photos: collapse the per-tag subquery loop in the tag filter
into a single GROUP BY ... HAVING COUNT(DISTINCT) = N subquery so the
cost is independent of how many tags the user is filtering on.
- useFilterUrlSync: type the parseUrl return value as
Partial<FilterState> & { currentSection?: string } so the section field
doesn't need an (out as any) cast.
- Timeline sticky header: bump opacity, padding, and border so it reads
more clearly against the underlying grid.
- FilterPill clear: convert the nested <button> (invalid HTML — buttons
cannot nest) to a span with role=button + keyboard handler, with a
larger hit area.
- RightSidebar: add aria-label to the close-X buttons so screen readers
announce them.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>