fix(mp): 导航/请求健壮性 — reLaunch 去重 + 失败降级

- navigateToLogin 添加去重 + reLaunch 失败降级 redirectTo
- request.ts safeReLaunch 添加目标页检测 + 失败降级
- 退出登录 reLaunch 失败降级 redirectTo
- DoctorTabBar / 首页医生端跳转 reLaunch 失败降级
- 网络恢复时正确清理 toast 状态和定时器

apps/miniprogram/src/services/request.ts

@@ -30,6 +30,7 @@ const OFFLINE_MAX_MS = 30_000;
 let offlineDetectedAt = 0;
 let offlineSuppressMs = OFFLINE_SUPPRESS_MS;
 let networkToastShown = false;
+let networkToastTimer: ReturnType<typeof setTimeout> | null = null;
 let consecutiveNetErrors = 0;
 
 function isOffline(): boolean {
@@ -44,7 +45,8 @@ function markOffline(): void {
   if (!networkToastShown) {
     networkToastShown = true;
     Taro.showToast({ title: '网络异常，请检查连接', icon: 'none', duration: 2000 });
-    setTimeout(() => { networkToastShown = false; }, offlineSuppressMs);
+    if (networkToastTimer) clearTimeout(networkToastTimer);
+    networkToastTimer = setTimeout(() => { networkToastShown = false; networkToastTimer = null; }, offlineSuppressMs);
   }
 }
 
@@ -52,6 +54,8 @@ function clearOffline(): void {
   offlineDetectedAt = 0;
   offlineSuppressMs = OFFLINE_SUPPRESS_MS;
   consecutiveNetErrors = 0;
+  if (networkToastTimer) { clearTimeout(networkToastTimer); networkToastTimer = null; }
+  networkToastShown = false;
 }
 
 function safeGet(key: string): string {
@@ -157,9 +161,15 @@ async function doRefresh(): Promise<boolean> {
 let reLaunchPromise: Promise<void> | null = null;
 
 function safeReLaunch(url: string): void {
+  // 已在目标页，跳过（防止 DevTools reLaunch bug）
+  const pages = Taro.getCurrentPages();
+  const currentPath = pages[pages.length - 1]?.path || '';
+  if (currentPath.includes('pages/login')) return;
   if (reLaunchPromise) return;
   reLaunchPromise = Taro.reLaunch({ url }).then(() => {}, (err) => {
     console.warn('[request] reLaunch failed:', err);
+    // reLaunch 失败时降级为 redirectTo
+    Taro.redirectTo({ url }).catch(() => {});
   }).then(() => {
     setTimeout(() => { reLaunchPromise = null; }, 2000);
   });