refactor(plex): split PlexBrowse god-file into cards + views + shared UI (E4 S4)
Pure behaviour-preserving code-motion — PlexBrowse 1751 -> 538 lines. The ~11 inlined components are self-contained (every view is invoked with shell callbacks as props; no view reaches back into shell state), so they just move to sibling files. New files: - lib/plexWatch.ts: toggleWatchState (shared by the grid + person page) - components/plexCards.tsx: PlexPosterCard, SeasonCard, CastStrip, RelatedStrip, EpisodeCard - components/plexViews.tsx: PlexInfoView, PlexPersonView, PlexShowView, PlexSeasonView - lib/plexDetailUi.tsx (extended): BackBtn, ActionBtn, WatchedToggle, DetailHero, epLabel (the file's own remit — "shared detail-page UI") PlexBrowse keeps the Sub router + PLEX_SUB_URL + PAGE + PlexBrowse() shell. Repointed the only external importer (PlexPersonView.dom.test) to plexCards/plexViews. Self-E2E (localdev): Plex grid renders (poster cards + episodes); The Expanse show-drill renders the hero + action buttons + season cards; ?v=show URL-mirroring intact; 0 console errors. Gate green: typecheck, knip, eslint (0 err), prettier, 247 vitest.
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