Match cards: composed title, header stage from match title, equal-sized grid

- SportsMatchController syncs Video.title with SportsMatch.title on
  store/update so the "Match title" field drives the video's display
  title everywhere.
- headerData(): "championship" now prefers event_name (event title)
  and adds a dedicated "stage" key sourced from SportsMatch.title
  (shown between the yellow lines above the weight class in both the
  in-player VS overlay and the vs-mini gallery card).
- Video cards render match titles with flags + corner colours
  ("FINALS – 🇧🇭 Blue vs 🇧🇭 Red (-61 kg)"), matching the video
  page header, and clip long titles to one line.
- Video gallery grid uses repeat(N, minmax(0, 1fr)) + grid-auto-rows:1fr
  so every card thumbnail renders at exactly the same size; hover-preview
  videos use object-fit:cover to stop portrait sources looking smaller.

Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>

resources/views/components/partials/vs-mini.blade.php

@@ -27,7 +27,7 @@
     // are hidden by `.vsm-nullable:empty` / `.vsm-nullable-hide` in the
     // CSS below. Same treatment as the full-page VS.
     $vsm_event   = $vsm_str($vsm_hd['championship']    ?? '');
-    $vsm_stage   = $vsm_str($vsm_hd['division']        ?? '') ?: $vsm_str($vsm_hd['format'] ?? '');
+    $vsm_stage   = $vsm_str($vsm_hd['stage']           ?? '');
     $vsm_weight  = $vsm_str($vsm_hd['weight_category'] ?? '');
     $vsm_matchNo = $vsm_str($vsm_hd['match_number']    ?? '');
     $vsm_court   = $vsm_str($vsm_hd['court']           ?? '');