fix(conversation): topic chips after warmup + English chip copy

- Buffer topic_suggestions until chat UI attaches (uiOwner + callback); replay on attach
- build_topic_chips respects user language for label/text; router passes user_language

Co-authored-by: Cursor <cursoragent@cursor.com>

app-expo/src/features/conversation/realtime-session.ts

@@ -32,6 +32,8 @@ export type TopicSuggestionsCallback = (payload: {
   suggestions: TopicSuggestion[];
 }) => void;
 
+type TopicSuggestionsPayload = Parameters<TopicSuggestionsCallback>[0];
+
 /** WebSocket `tts_audio`：服务端可能只带 base64、只带 COS URL，或两者都有 */
 export type TtsSegmentPayload = {
   audioBase64?: string;
@@ -85,6 +87,8 @@ export class RealtimeSession {
   private streamingBuffer = '';
   /** 单段回复且服务端带 `assistant_message_id` 时用于落缓存 id */
   private pendingAssistantMessageId: string | null = null;
+  /** WS 在聊天页挂载 `onTopicSuggestions` 之前到达（如列表预热连开场）时暂存，接棒后重放 */
+  private pendingTopicSuggestionsPayload: TopicSuggestionsPayload | null = null;
   private destroyed = false;
 
   /** 本条用户消息是否请求「先 TTS 再出字」的助手轮次 */
@@ -162,6 +166,15 @@ export class RealtimeSession {
     if (!this.assistantTurnTtsSync && this.streamingBuffer.trim().length > 0) {
       this.onStreamingText?.(this.streamingBuffer, false);
     }
+    if (
+      this.uiOwner &&
+      this.pendingTopicSuggestionsPayload &&
+      this.onTopicSuggestions
+    ) {
+      const p = this.pendingTopicSuggestionsPayload;
+      this.pendingTopicSuggestionsPayload = null;
+      this.onTopicSuggestions(p);
+    }
   }
 
   releaseUiCallbacks(
@@ -197,6 +210,7 @@ export class RealtimeSession {
     this.resetAssistantTtsSyncState();
     this.unsubEvent?.();
     this.unsubState?.();
+    this.pendingTopicSuggestionsPayload = null;
     this.client.dispose();
   }
 
@@ -394,11 +408,17 @@ export class RealtimeSession {
     }
 
     if (event.kind === 'topic_suggestions') {
-      this.onTopicSuggestions?.({
+      const payload: TopicSuggestionsPayload = {
         reason: event.reason,
         stage: event.stage,
         suggestions: event.suggestions,
-      });
+      };
+      if (this.uiOwner && this.onTopicSuggestions) {
+        this.pendingTopicSuggestionsPayload = null;
+        this.onTopicSuggestions(payload);
+      } else {
+        this.pendingTopicSuggestionsPayload = payload;
+      }
       return;
     }