fix(sqlite,browser): resolve SQLite connection pool deadlock, disable stale SW cache, and update BRAIN.md

frontend/src/lib/api.ts

@@ -40,6 +40,7 @@ async function request<T>(path: string, options: RequestInit = {}, isRetry = fal
   const token = getToken();
   const headers: Record<string, string> = {
     'Content-Type': 'application/json',
+    'Cache-Control': 'no-cache',
     ...(options.headers as Record<string, string>),
   };
 
@@ -47,16 +48,27 @@ async function request<T>(path: string, options: RequestInit = {}, isRetry = fal
     headers['Authorization'] = `Bearer ${token}`;
   }
 
-  const res = await fetch(path, {
-    ...options,
-    headers,
-  });
+  const controller = new AbortController();
+  const timeoutId = window.setTimeout(() => controller.abort(), 8000);
+
+  let res: Response;
+  try {
+    res = await fetch(path, {
+      ...options,
+      headers,
+      cache: 'no-store',
+      signal: controller.signal,
+    });
+  } finally {
+    window.clearTimeout(timeoutId);
+  }
 
   if (res.status === 401 && !isRetry && !path.includes('/auth/login') && !path.includes('/auth/quickstart')) {
     try {
       const qsRes = await fetch('/api/v1/auth/quickstart', {
         method: 'POST',
         headers: { 'Content-Type': 'application/json' },
+        cache: 'no-store',
       });
       if (qsRes.ok) {
         const qsData = await qsRes.json();