Mirrors the music side instead of a custom scheme: library cards are genuine
<a href='/video-detail/<source>/<kind>/<id>'> links, so reload / new-tab / Back /
Forward all work. Left-clicks are intercepted into SPA nav + history.pushState;
modifier-clicks fall through to the real URL.
- popstate restores the detail from the URL; the '← Library' back button is real
history.back(); deep-link / reload to a /video-detail/... URL is restored on load
(path captured before applySide can clear it). Server already serves the SPA for
these paths (permissive catch-all) — no backend change.
- The path carries a SOURCE segment ('library' = a video.db id today; 'tmdb' /
search results not yet in the library come later) — your library-vs-search split.
- Coexists with music's pathname router (only touches /video-detail/* and its own
popstate); music's link/popstate handlers ignore these paths.
Tests: real-link cards, pushState/popstate routing, source segment.
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