Drops the ?tag=<name> lookup. URLs become unambiguous (distinct
same-name characters each have their own id-keyed URL). Eager-loads
Tag.fandom for the active-tag header rendering.
Applied to all four gallery routes: /gallery, /api/gallery/scroll,
/api/gallery/timeline, /api/gallery/jump — they all shared the same
name-keyed filter pattern. (Plan named only the first two; extended
to all four for behavioral consistency so partial JS migration to
tag_id doesn't silently drop filter on the sub-APIs.)
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
bvandeusen
1e19048b09