style: move kickoff time to card header, better date header spacing

- Kickoff time now in header row: "Gruppe A · 04:00 Uhr · in 61 Tagen"
  instead of centered between flags (avoids visual misalignment)
- Date timeline headers: more top padding for balanced spacing
  between cards

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

frontend/src/components/MatchCard.module.css

@@ -77,17 +77,16 @@
   border: 1px solid rgba(75,183,248,0.15);
 }
 
-/* Kickoff row — above teams */
-.kickoffRow {
-  text-align: center;
-  margin-bottom: 8px;
+/* Kickoff badge in header row */
+.kickoffBadge {
+  font-size: 12px;
+  font-weight: 700;
+  color: var(--text-secondary);
+  letter-spacing: 0.02em;
 }
 
-.kickoffTime {
-  font-size: 12px;
-  font-weight: 600;
-  color: var(--text-secondary);
-  letter-spacing: 0.03em;
+.topRowSpacer {
+  flex: 1;
 }
 
 /* VS separator */