style: stadium scoreboard kickoff display in card header

Kickoff time styled as LED scoreboard: monospace font, dark background,
gold text with glow effect. Placed in card header next to group badge.
Cards are more compact without the separate kickoff row.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/components/MatchCard.module.css

@@ -77,17 +77,18 @@
   border: 1px solid rgba(75,183,248,0.15);
 }
 
-/* Kickoff time — centered above flags */
-.kickoffRow {
-  text-align: center;
-  margin-bottom: 6px;
-}
-
-.kickoffTime {
-  font-size: 13px;
+/* Kickoff — stadium scoreboard display */
+.kickoffDisplay {
+  font-family: 'Courier New', 'Lucida Console', monospace;
+  font-size: 16px;
   font-weight: 700;
-  color: var(--text-secondary);
-  letter-spacing: 0.05em;
+  color: var(--gold);
+  letter-spacing: 0.12em;
+  background: rgba(0, 0, 0, 0.4);
+  padding: 3px 10px;
+  border-radius: 4px;
+  border: 1px solid rgba(254, 174, 50, 0.15);
+  text-shadow: 0 0 8px rgba(254, 174, 50, 0.5);
 }
 
 .topRowSpacer {