fix: 修复 showPlan 工具交互逻辑和 JWT Token 问题

- 修复 pendingQuestions 缺失时无法提交回答的问题
- 添加 fallbackTaskId 参数支持直接发送到后端
- apiClient 自动获取 JWT Token
- 取消按钮改为中止对话而非发送消息

src/services/sseHandler.ts

@@ -173,7 +173,8 @@ export async function startStreamDialog(
         'Content-Type': 'application/json',
         'Accept': 'text/event-stream',
         'Cache-Control': 'no-cache',
-        'Content-Length': Buffer.byteLength(body)
+        'Content-Length': Buffer.byteLength(body),
+        ...(request.token ? { 'Authorization': `Bearer ${request.token}` } : {})
       }
     };
 
@@ -183,9 +184,20 @@ export async function startStreamDialog(
         let errorBody = '';
         res.on('data', chunk => errorBody += chunk);
         res.on('end', () => {
-          const error = new Error(`SSE 连接失败: ${res.statusCode} ${errorBody}`);
-          callbacks.onError?.({ message: error.message });
-          reject(error);
+          // 检测是否是登录状态过期
+          const isLoginExpired = errorBody.includes('登录状态已过期') ||
+                                 errorBody.includes('token') && errorBody.includes('过期') ||
+                                 res.statusCode === 401;
+
+          if (isLoginExpired) {
+            const error = new Error('LOGIN_EXPIRED:登录状态已过期，请重新登录');
+            callbacks.onError?.({ message: error.message });
+            reject(error);
+          } else {
+            const error = new Error(`SSE 连接失败: ${res.statusCode} ${errorBody}`);
+            callbacks.onError?.({ message: error.message });
+            reject(error);
+          }
         });
         return;
       }