fix: improve tipping user journey

- Dashboard "Jetzt tippen" opens TipModal directly instead of
  navigating to /spiele (no more dead-end spielplan)
- After tipping, dashboard updates to show "Dein Tipp: X:Y ✓"
- Spielplan auto-opens all sections when only 1-2 exist
  (no more collapsed "Demnächst" as only section)

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

frontend/src/pages/DashboardPage.tsx

@@ -1,6 +1,7 @@
 import { useEffect, useState } from 'react';
 import { useNavigate } from 'react-router-dom';
-import { api, DashboardData } from '../api/client';
+import { api, DashboardData, Match } from '../api/client';
+import TipModal from '../components/TipModal';
 import styles from './DashboardPage.module.css';
 
 interface Props {
@@ -25,6 +26,7 @@ export default function DashboardPage(_props: Props) {
   const [data, setData] = useState<DashboardData | null>(null);
   const [loading, setLoading] = useState(true);
   const [error, setError] = useState(false);
+  const [tipMatch, setTipMatch] = useState<Match | null>(null);
   const navigate = useNavigate();
 
   useEffect(() => {
@@ -90,7 +92,23 @@ export default function DashboardPage(_props: Props) {
             ) : hero.tippable ? (
               <button
                 className={styles.heroTipBtn}
-                onClick={e => { e.stopPropagation(); navigate('/spiele'); }}
+                onClick={e => {
+                  e.stopPropagation();
+                  setTipMatch({
+                    id: hero.match.id,
+                    externalId: 0,
+                    utcDate: hero.match.utcDate,
+                    status: hero.match.status,
+                    stage: '',
+                    group: null,
+                    homeTeam: hero.match.homeTeam,
+                    awayTeam: hero.match.awayTeam,
+                    score: { home: null, away: null },
+                    userTip: null,
+                    minutesUntilKickoff: hero.match.minutesUntilKickoff,
+                    tippable: true,
+                  });
+                }}
               >
                 Jetzt tippen
               </button>
@@ -138,6 +156,23 @@ export default function DashboardPage(_props: Props) {
           ))}
         </div>
       )}
+
+      {tipMatch && (
+        <TipModal
+          match={tipMatch}
+          onClose={() => setTipMatch(null)}
+          onSaved={(_matchId, tipHome, tipAway) => {
+            setTipMatch(null);
+            // Update dashboard data to reflect the new tip
+            if (data && data.hero) {
+              setData({
+                ...data,
+                hero: { ...data.hero, userTip: { home: tipHome, away: tipAway } },
+              });
+            }
+          }}
+        />
+      )}
     </div>
   );
 }