feat(game): remove +/- score buttons; tap to increment (Fixes #29)

- Remove plus/minus score controls in GameDetail; tap on score increments by +1
- Keep global Undo control for reversals; maintain keyboard accessibility on score
- No changes to scoring logic beyond UI control removal

src/components/GameDetail.tsx

@@ -78,22 +78,7 @@ const GameDetail = ({ game, onFinishGame, onUpdateScore, onUpdateGame, onUndo, o
               >
                 {scores[idx]}
               </span>
-              <div className={styles['score-buttons']}>
-                <button
-                  className={styles['score-button']}
-                  disabled={isCompleted}
-                  onClick={() => (onUndo ? onUndo() : undefined)}
-                  aria-label={`Punkt abziehen für ${name}`}
-                  title={`Punkt abziehen für ${name}`}
-                >-</button>
-                <button
-                  className={styles['score-button']}
-                  disabled={isCompleted}
-                  onClick={() => handleScoreUpdate(idx+1, 1)}
-                  aria-label={`Punkt hinzufügen für ${name}`}
-                  title={`Punkt hinzufügen für ${name}`}
-                >+</button>
-              </div>
+              {/* +/- buttons removed per issue #29. Tap score to +1; use Undo to revert. */}
             </div>
           );
         })}