- VideoCard: replace <a href> with <Link> so navigation stays
 client-side
- getChannel/getUploadsPlaylistId: throw notFound() so the route renders
 notFoundComponent instead of an unstyled error
- fetchDislikes: cache null results with long TTL so transient 4xx/5xx
 failures don't keep hammering the third-party API
- Hero & VideoPlayer: reset apiPromise on script-load failure so retries
 work;
 clean up the YT.Player created by a now-cancelled effect
- Hero: loop preview when hovering so a Short clip doesn't end on the
 thumbnail mid-hover
- Home route: refactor resize-driven feed upgrade out of a state-updater
 side-effect, throttle resize with rAF, deduplicate concurrent fetches,
 add an errorComponent
- All routes: add errorComponent so API failures don't fall through to
 the
 default router error UI
- Server: guard against invalid publishedAt dates in sort comparators
- Header + new /channels route: give users a discoverable index of
 approved
 channels; Home link now uses exact match for active state