fix: hoist prompt toast to App.vue so it survives ChoicePanel unmount after selection

src/App.vue

@@ -26,6 +26,8 @@ const showChapterSelect = ref(false)
 const hasAutoSave = ref(false)
 const currentSpeed = ref(1)
 const canSkip = ref(false)
+const promptToast = ref('')
+const showPromptToast = ref(false)
 
 const { loadGame, start, resumeAutoSave, makeChoice, clickHotspot, startChapter,
   skipScene, setSpeed, getSpeed, isSceneWatched,
@@ -57,6 +59,12 @@ function onChoose(index: number) {
   makeChoice(index)
 }
 
+function onPrompt(text: string) {
+  promptToast.value = text
+  showPromptToast.value = true
+  setTimeout(() => { showPromptToast.value = false }, 2500)
+}
+
 function toggleMenu() {
   showMenu.value = !showMenu.value
   if (showMenu.value) {
@@ -167,7 +175,11 @@ init()
           :timer-total="store.timerTotal"
           :timer-remaining="store.timerRemaining"
           @choose="onChoose"
+          @prompt="onPrompt"
         />
+        <Transition name="prompt-toast">
+          <div v-if="showPromptToast" class="prompt-toast">{{ promptToast }}</div>
+        </Transition>
         <div v-if="started && !store.gameEnded" class="top-bar">
           <LangSwitch />
           <PlaybackBar
@@ -356,4 +368,27 @@ html, body {
 .end-btn:hover {
   background: rgba(255, 200, 100, 0.15);
 }
+
+.prompt-toast {
+  position: absolute;
+  top: 50%;
+  left: 50%;
+  transform: translate(-50%, -50%);
+  padding: 16px 36px;
+  font-size: 20px;
+  color: #ffc107;
+  background: rgba(0, 0, 0, 0.85);
+  border: 1px solid rgba(255, 193, 7, 0.4);
+  border-radius: 6px;
+  letter-spacing: 3px;
+  text-align: center;
+  white-space: nowrap;
+  pointer-events: none;
+  z-index: 50;
+}
+
+.prompt-toast-enter-active { transition: opacity 0.3s ease; }
+.prompt-toast-leave-active { transition: opacity 0.8s ease; }
+.prompt-toast-enter-from,
+.prompt-toast-leave-to { opacity: 0; }
 </style>