New FEED_TYPES.TRENDING tab: the active (recently-added) source ranked by view
count (recency tiebreak, trusted-muted last), gated by FEATURE_TRENDING_FEED
(default on). Builds on the now-trustworthy view counts (#4).
- createTrendingSorter reads counts from runtime.getViewCount, which resolves
each video's pointer via the app's canonical deriveVideoPointerInfo against the
shared viewCounter cache (new getVideoViewCountSnapshot export) — the same
counts the grid cards already load.
- Live re-rank: viewCounter now emits a coalesced onViewCountsChanged signal;
while the Trending view is active it debounce-re-runs the feed (cheap re-rank
over the in-memory active set, no relay re-fetch), so the order settles into
true trending as counts stream in. Cold cache reads as recency, then improves.
- Pipeline extracted to js/feedEngine/trendingFeed.js (feedCoordinator is at its
size cap; bumped the cap for the thin load/refresh delegations).
- Wiring: FEED_TYPES + flag, feedCoordinator cases, app.js wrappers,
applicationBootstrap registration (hides the sidebar link when flag off),
viewManager init + js/trendingView.js, views/trending.html, sidebar link.
Tests: tests/trending-sorter.test.mjs.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
