fix: clear reply suggestions cache on cancel, regenerate when switching styles - Cancel now clears reply_suggestions from email_context - Selecting style with empty cache triggers fresh AI generation - Selecting style with cache uses cached suggestions - Tests: 3/3 passing

src/tg_bot.py

@@ -356,11 +356,23 @@ def _handle_callback(tg_cfg: TelegramConfig, cfg: Config, cb: dict):
         logger.info("  进入回复流程, prompt_msg_id=%d", prompt_msg_id)
 
     elif action in (CALLBACK_AI_REPLY_FULL, CALLBACK_AI_REPLY_SHORT) and ctx:
-        suggestions = ctx["summary_data"].get("reply_suggestions", [])
         style = "full" if action == CALLBACK_AI_REPLY_FULL else "short"
+        suggestions = ctx["summary_data"].get("reply_suggestions", [])
+
+        # 缓存为空时重新生成
         if not suggestions:
-            send_text(tg_cfg, str(chat_id), "此邮件无需回复。")
+            logger.info("  缓存为空，重新生成 AI 回复 (style=%s)", style)
-            logger.info("  AI 判定无需回复，隐藏")
+            _tg_req(tg_cfg, "editMessageText", {
+                "chat_id": chat_id, "message_id": msg_id,
+                "text": "🤖 *AI思考中…*", "parse_mode": "MarkdownV2",
+            })
+            conv = load_conversation(chat_id) or {}
+            conv["state"] = "ai_reply_selection"
+            conv["summary_msg_id"] = msg_id
+            conv["reply_style"] = style
+            conv["all_suggestions"] = []
+            save_conversation(chat_id, conv)
+            _ai_pool.submit(_do_regen, cfg, chat_id, msg_id, ctx, conv)
             return
 
         save_conversation(chat_id, {
@@ -433,7 +445,10 @@ def _handle_callback(tg_cfg: TelegramConfig, cfg: Config, cb: dict):
 
     elif action == CALLBACK_CANCEL:
         delete_conversation(chat_id)
+        # 清除回复建议缓存，重新选择时会重新生成
         if ctx:
+            ctx["summary_data"]["reply_suggestions"] = []
+            save_email_context(msg_id, ctx)
             can_reply = ctx.get("can_reply", True)
             _tg_req(tg_cfg, "editMessageText", {
                 "chat_id": chat_id, "message_id": msg_id,