A cold hard-refresh on a profile previously sat on "Loading videos…" for
~5s — the optimistic in-memory cache is empty on cold start (ingest hasn't
injected yet) and the grid waited on relay connection.
Now channelProfileVideos.js persists the last-rendered wall per author
(localStorage bitvid:channel-videos:v1) and loadUserVideos paints it
immediately on cold load, before relays connect; the live fetch then
replaces it. Bounded (60 videos/channel, 20 channels LRU-evicted) and
strips the heavy raw `tags` array. Same proven pattern as the main feed's
optimistic cache.
Closes TODO 17d per-channel cache. Tests + mutation-verified (round-trip,
tag-strip, per-channel + channel-count caps). 1267/1268 unit (known flake).
Co-Authored-By: Claude Opus 4.8 <[email protected]>
