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/videos/partials/match/vs/index.blade.php

@@ -21,7 +21,9 @@
     $vsStr = fn ($x) => (is_string($x) && trim($x) !== '') ? trim($x) : '';
 
     $vsEvent   = $vsStr($hd['championship']        ?? '');
-    $vsStage   = $vsStr($hd['division']            ?? '') ?: $vsStr($hd['format'] ?? '');
+    // Sub-header stage between the two yellow lines above the weight class.
+    // Sourced from headerData().stage (championship_name → division → format).
+    $vsStage   = $vsStr($hd['stage']                ?? '');
     $vsWeight  = $vsStr($hd['weight_category']     ?? '');
     $vsMatchNo = $vsStr($hd['match_number']        ?? '');
     $vsCourt   = $vsStr($hd['court']               ?? '');