feat: Implement rematch functionality

Refs #17

Adds a 'Rematch' button to the game completion modal.

Introduces a 'handleRematch' function in 'App.jsx' to create a new game with the same players and settings as the previous game.

The 'onRematch' handler is passed down to the 'GameCompletionModal' component.

Adds '.gitea' to '.gitignore' to prevent tracking local issue context.

.gitignore

@@ -24,4 +24,4 @@ pnpm-debug.log*
 .idea/
 
 .gitea
-dev/
+dev/.gitea

src/components/App.jsx

@@ -117,6 +117,22 @@ const App = () => {
     setScreen('game-detail');
   }, [currentGameId]);
 
+  const handleRematch = useCallback(() => {
+    const completedGame = games.find(g => g.id === currentGameId);
+    if (!completedGame) return;
+
+    const newId = handleCreateGame({
+      player1: completedGame.player1,
+      player2: completedGame.player2,
+      player3: completedGame.player3,
+      gameType: completedGame.gameType,
+      raceTo: completedGame.raceTo,
+    });
+    
+    setCompletionModal({ open: false, game: null });
+    showGameDetail(newId);
+  }, [games, currentGameId, handleCreateGame, showGameDetail]);
+
   // Delete game
   const handleDeleteGame = useCallback((id) => {
     setModal({ open: true, gameId: id });
@@ -258,6 +274,7 @@ const App = () => {
         game={completionModal.game}
         onConfirm={handleConfirmCompletion}
         onClose={() => setCompletionModal({ open: false, game: null })}
+        onRematch={handleRematch}
       />
       <FullscreenToggle />
     </div>

src/components/GameCompletionModal.jsx

@@ -9,9 +9,10 @@ import styles from './GameCompletionModal.module.css';
  * @param {object} props.game
  * @param {Function} props.onConfirm
  * @param {Function} props.onClose
+ * @param {Function} props.onRematch
  * @returns {import('preact').VNode|null}
  */
-const GameCompletionModal = ({ open, game, onConfirm, onClose }) => {
+const GameCompletionModal = ({ open, game, onConfirm, onClose, onRematch }) => {
   if (!open || !game) return null;
   const playerNames = [game.player1, game.player2, game.player3].filter(Boolean);
   const scores = [game.score1, game.score2, game.score3].filter((_, i) => playerNames[i]);
@@ -41,6 +42,7 @@ const GameCompletionModal = ({ open, game, onConfirm, onClose }) => {
         </div>
         <div className={modalStyles['modal-footer']}>
           <button className={styles['btn'] + ' ' + styles['btn--warning']} onClick={onConfirm} aria-label="Bestätigen">Bestätigen</button>
+          <button className={styles['btn'] + ' ' + styles['btn--primary']} onClick={onRematch} aria-label="Rematch">Rematch</button>
           <button className={styles['btn']} onClick={onClose} aria-label="Abbrechen">Abbrechen</button>
         </div>
       </div>