feat(frontend): 对局视图 + 回放视图 + 计时器 hook

src/components/game/GameView.tsx

@@ -0,0 +1,21 @@
+import BoardCanvas from '../board/BoardCanvas';
+import GameInfo from './GameInfo';
+import GameControls from './GameControls';
+import TimerDisplay from './TimerDisplay';
+
+interface Props {
+  onBackToMenu: () => void;
+}
+
+export default function GameView({ onBackToMenu }: Props) {
+  return (
+    <div className="game-view">
+      <GameInfo />
+      <div className="board-container">
+        <BoardCanvas />
+      </div>
+      <TimerDisplay />
+      <GameControls onBackToMenu={onBackToMenu} />
+    </div>
+  );
+}