Smart back (mirrors music's artist-detail): the top-left back button now
remembers where you actually came from, many layers deep. It keeps an origin
stack ({page} or {detail title}) and stamps each history entry with its layer
depth, so:
- the label is dynamic — '← Back to Search' / '← Back to The Bear' / '← Back to
<person>' — instead of a hardcoded 'Library'/'Back';
- backing out of the first layer returns to the page you started from (Search,
Watchlist, wherever), not always the Library;
- browser Back and our button both unwind the chain one layer at a time, in sync.
Fixes: search → person → back → movie used to mislabel as 'Library' and dump you
in the library.
Next level:
- Search isn't a blank box when idle — a 'Trending this week' rail (TMDB
trending, owned/preview annotated). Returns when you clear the query.
- Person page gets a 'Known For' hero rail (top titles by popularity) above a
full filmography now sorted chronologically (newest first).
Backend: TMDBClient.trending + engine.trending (+library annotation), route
/api/video/trending. Isolated; 237 video-suite tests pass.
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