The channel page was capped at the recent 90 (yt-dlp flat, hard min(90,limit)),
so prolific channels (Ninja Kidz etc.) showed only ~90 of hundreds. Now it loads
everything via YouTube's InnerTube API, paginated by continuation token — each
page fetched once (O(n), light on rate limits), unlike yt-dlp offset batches
which re-scan from the start every time.
- core: innertube_parse_video_items (keeps title+thumbnail, not just dates) +
innertube_channel_videos_page(channel_id, continuation) → {videos, continuation}.
- api: GET /youtube/channel/<id>/videos?continuation=<tok> returns ~a batch of
videos (approx dates, refined from the date cache) + the next token.
- frontend: ytLoadAllVideos streams batches after the fast initial 90 render,
folding each into the year-seasons live — backfills dates on the videos already
shown AND appends older ones, re-rendering per batch (episode grid only when the
viewed season changed). Replaces the old date-only re-poll (this dates AND
expands). Safety ceiling 2000; a 'Loading full history… N so far' indicator.
Validated live (MrBeast: 30/page, clean continuation, all dated). 101 tests green.