fix(frontend): smooth realtime dashboard refreshes

app/game-frontend/src/views/MainView.vue

@@ -31,6 +31,7 @@ const npcMode = ref(0);
 
 const {
     loading,
+    refreshing,
     error,
     recordsError,
     frontStatusError,
@@ -158,7 +159,13 @@ watch(
                 >
                     실시간 동기화: {{ realtimeLabel }}
                 </button>
-                <button class="game-shell__action game-shell__action--navigation" type="button" @click="loadMainData">
+                <button
+                    class="game-shell__action game-shell__action--navigation"
+                    type="button"
+                    :disabled="refreshing"
+                    :aria-busy="refreshing"
+                    @click="loadMainData"
+                >
                     갱 신
                 </button>
                 <button class="game-shell__action" type="button" @click="moveLobby">로비로</button>