fix(hub): stop badging every poster "unmatched" when TMDB is off

The dashed warning outline and the "?" flag say a TMDB lookup ran and came
back with nothing — that is how an operator finds the titles worth a "Fix
match". With TMDB switched off for the group no lookup is made at all:
media_meta_req answers confidence 0 for the whole library by design, so the
poster grid drew every card as a failure of the very thing the operator
chose, with no poster ever coming to clear it.

Poster mode now shows the file's own thumbnail plainly in that case, the
same as Flat does, and keeps the badge for what it was built for.

- PosterCard takes tmdbEnabled and gates both the outline and the "?" on
  `tmdbEnabled && !confident`. The title still falls back to the parsed
  filename exactly as before, and the ready/imageReady anti-flash gating is
  untouched.
- VideoDetailModal gates its "no confident match" paragraph the same way. A
  show still opens that modal with TMDB off — it is where the season list
  lives — so the card alone would have left the claim one click deeper.
- Its operator-only "Fix match" / "Rematch" buttons are gated too: both act
  on a match that does not exist, one opening a search the node answers
  empty, the other dropping a cached match never made. Those buttons are the
  only entry points to TmdbSearchOverlay and doRematch.
- Both props default to true, so a call site that forgets one keeps the badge
  rather than silently losing it.

search-page.js is deliberately left passing `enabled: true`: a cross-group
view has no single group's switch to read, and it never showed the operator
buttons anyway (isNodeAdmin={false}).

Recorded as §10.7 in docs/mediacenter.md.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01V8EDjk6pkYZrCbo63m2x87

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