fix game btns

client/src/components/game.ctrl.btns.jsx

@@ -54,17 +54,28 @@ function GameCtrlBtns(args) {
         game,
         animating,
 
+        getInstanceState,
         sendGameSkillClear,
         sendReady,
+        quit,
     } = args;
 
     if (!game) return false;
+    const finished = game.phase === 'Finish';
+
+    function quitClick() {
+        getInstanceState();
+        quit();
+    }
+
+    const readyBtn = <button disabled={animating} class="ready" onClick={() => sendReady()}>Ready</button>;
+    const quitBtn = <button disabled={animating} onClick={quitClick}>Back</button>;
 
     return (
         <div class="game-ctrl-btns">
             <button disabled={true} >Chat</button>
             <button disabled={animating} onClick={sendGameSkillClear}>Clear</button>
-            <button disabled={animating} class="ready" onClick={() => sendReady()}>Ready</button>
+            {finished ? quitBtn : readyBtn}
         </div>
     );
 }