E5 S3: unified Plex card — scrim-reveal hover + rest polish

The poster card (grid + person page) gets the Seerr-style hover: on hover a
bottom scrim slides up with the title, a "year · runtime · ★rating" meta line,
and a 3-line synopsis — the info you'd otherwise click through for — plus a
less-flat play ring (radial-gradient + ring shadow) and a top-right quick-action
cluster (Info + watched-toggle, revealed on hover / always on touch). Rest-state
badges (season / type tag) yield to the scrim on hover; the playable-cost tint
stays. (§1 A + C from the enrichment study.)

Backend (the data the scrim needs, mirroring S1's `art`): the grid
(browse.unified_library) now emits a lang-coalesced, truncated `summary` (new
query.summary_col) + the Plex `rating`; movie_card/show_card do the same (EN) for
the detail/related/person cards. PlexCard.rating type added (summary already
existed for episodes).

Gate: tsc x3 / eslint / prettier / knip / vitest 326 green; ruff green; backend
lane full suite green. Self-E2E on the live dev server (rebuilt on this branch,
S2-enriched): the grid serves rating+summary (Shawshank 9.3, Godfather 9.2, real
synopses) and the card renders the play ring + scrim (The Expanse: ring, synopsis,
★8.1) — verified via the DOM (the pane wouldn't composite for a screenshot).

backend/app/plex/cards.py

@@ -14,12 +14,21 @@ def _art_url(rating_key: str, art_key: str | None) -> str | None:
     return f"/api/plex/image/{rating_key}?variant=art" if art_key else None
 
 
+# Card hover-overview: a short synopsis for the reveal panel, trimmed so a strip/related row of cards
+# stays a few hundred bytes each rather than carrying full synopses. (These non-grid card paths serve
+# the EN summary/rating; the main grid coalesces the HU twin in browse.unified_library.)
+def _card_summary(summary: str | None) -> str | None:
+    return (summary or "")[:300] or None
+
+
 def movie_card(it: PlexItem, st: PlexState | None) -> dict:
     return {
         "id": it.rating_key,
         "type": "movie",
         "title": it.title,
         "year": it.year,
+        "rating": it.rating,
+        "summary": _card_summary(it.summary),
         "duration_seconds": it.duration_s,
         "thumb": f"/api/plex/image/{it.rating_key}",
         "art": _art_url(it.rating_key, it.art_key),
@@ -35,6 +44,8 @@ def show_card(sh: PlexShow, status: str = "new") -> dict:
         "type": "show",
         "title": sh.title,
         "year": sh.year,
+        "rating": sh.rating,
+        "summary": _card_summary(sh.summary),
         "thumb": f"/api/plex/image/{sh.rating_key}",
         "art": _art_url(sh.rating_key, sh.art_key),
         "season_count": sh.child_count,

backend/app/plex/query.py

@@ -29,6 +29,11 @@ def title_col(model, lang: str):
     return func.coalesce(model.title_hu, model.title) if lang == "hu" else model.title
 
 
+def summary_col(model, lang: str):
+    """DISPLAY summary, HU-coalesced (EN fallback) — the card hover-overview + info page read this."""
+    return func.coalesce(model.summary_hu, model.summary) if lang == "hu" else model.summary
+
+
 def genres_col(model, lang: str):
     # type_coerce so the JSONB comparator (`.contains` / `@>`, GIN-backed) survives the coalesce.
     if lang == "hu":