fix: on restart, serve a video's cached TMDB match instead of re-searching

Root of the 2026-08-29 demo35 storms. `_do_media_meta_request` could not
tell "this is a movie" from "this video isn't enriched yet" — both have
season/episode None — so during a slow initial scan with a browser on the
Videos tab, every show episode requested was run through the *movie*
search path with its raw filename as the query
(`search/movie?query=Show S01E01 1080p WEB DL ...`), hundreds per second,
until TMDB rate-limited and posters stopped loading. Worse, an
un-enriched show episode's own valid cached "tv" match was treated as
stale (its provisional kind was "movie"), so a file already resolved got
re-queried anyway.

- While a video is un-enriched (no display_title — enrich.py always sets
  one), never run a TMDB *search*. Serve the cached match if the content
  hash has one, honouring the cached kind ("tv"/"movie") rather than the
  provisional split; otherwise answer confidence 0.
- Once enriched, the strict `cached_media_type == media_type` check is
  unchanged: an enrichment fix that reclassifies a folder movie->tv still
  drops the stale match and re-resolves.
- video-app.js: `useMediaMeta` gains an `enrichSig` dependency
  (`entry.display_title`) so the client refetches once the enriched fields
  arrive on an index delta — the fileId is a content hash and never
  changes, so nothing else would retrigger it.

Not caused by the V8-V13 work; it raised the per-file call count so the
pre-existing race became a visible storm.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018BMLQjqFGCize2KtNBT79v

1 files changed, 12 insertions, 4 deletions

diff --git a/packages/meshbay-hub/src/meshbay_hub/static/video-app.js b/packages/meshbay-hub/src/meshbay_hub/static/video-app.js
index 6d13e27..50fbcf6 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/video-app.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/video-app.js
@@ -213,7 +213,13 @@ function bumpThumbGeneration() {
   for (const fn of _thumbRetryListeners) fn();
 }
 
-function useMediaMeta(transportRef, fileId, active) {
+// `enrichSig` — a value that changes when the entry's index-time
+// enrichment lands (display_title fills in). The node answers confidence 0
+// for a not-yet-enriched video (it can't tell it apart from a movie and
+// would otherwise storm TMDB with its raw filename), so the client must
+// refetch once the enriched fields arrive on an index delta — the fileId
+// (a content hash) never changes, so nothing else would trigger it.
+function useMediaMeta(transportRef, fileId, active, enrichSig) {
   const [meta, setMeta] = useState(null);
   const [refetchToken, setRefetchToken] = useState(0);
 
@@ -238,7 +244,7 @@ function useMediaMeta(transportRef, fileId, active) {
       } catch { if (!cancelled) setMeta({ confidence: 0 }); }
     })();
     return () => { cancelled = true; };
-  }, [fileId, active, refetchToken]);
+  }, [fileId, active, refetchToken, enrichSig]);
   return meta;
 }
 
@@ -280,7 +286,7 @@ function useSeasonMeta(transportRef, tmdbId, season, active) {
 function PosterCard({ title, subtitle, repEntry, transportRef, gekRef, onOpen, groupKey, onMetaResolved }) {
   const tRef = repEntry._tRef || transportRef;
   const gRef = repEntry._gRef || gekRef;
-  const meta = useMediaMeta(tRef, repEntry.id, true);
+  const meta = useMediaMeta(tRef, repEntry.id, true, repEntry.display_title || '');
   const confident = Boolean(meta && meta.confidence && meta.tmdb_id);
   const metaReady = meta !== null;
 
@@ -708,7 +714,9 @@ function PosterGrid({ movies, shows, transportRef, gekRef, onPreview, tmdbEnable
   const openDetail = (title, repEntry, show, files) => setDetail({ title, repEntry, show, files });
   const detailTRef = detail && detail.repEntry._tRef ? detail.repEntry._tRef : transportRef;
   const detailGRef = detail && detail.repEntry._gRef ? detail.repEntry._gRef : gekRef;
-  const detailMeta = useMediaMeta(detailTRef, detail ? detail.repEntry.id : null, !!detail);
+  const detailMeta = useMediaMeta(
+    detailTRef, detail ? detail.repEntry.id : null, !!detail,
+    detail ? (detail.repEntry.display_title || '') : '');
 
   return html`
     <div class="video-grid">