Two big pieces:
1) Wishlist YouTube tab now renders through the EXACT TV nebula (channel = show
orb, upload YEAR = season, video = episode) instead of a flat list. Made the
nebula source-aware: a youtube orb/season/label opens the in-app channel page
(not tmdb); season name shows the year; episode meta shows the upload date;
removes route through the youtube source_id endpoints (video / year / whole
channel); the info bar shows a selected video's description (no cast/no tmdb
fetch). Identical look — music wl-* + TMDB path untouched.
2) New in-app YouTube channel detail page (video-channel.js, sibling of
video-person.js) — opens via open-detail {kind:'channel'} from the watchlist
card, the wishlist orb/season, and deep links (/video-detail/youtube/channel/
<id>; router now accepts string ids + the new page). Banner hero, avatar,
subs/handle/video stats, description, Follow toggle, and a video grid where
each upload can be wished individually (duration + views + watch-on-YouTube).
Watchlist channel cards now open this page instead of bouncing to YouTube.
video-side.css .vc-*; JS brace-balanced; backend tests green.
