fix(frontend): auth error handler 5xx

web/frontend/src/routes/__root.tsx

@@ -1,6 +1,6 @@
 import { Outlet, createRootRoute, useRouterState } from "@tanstack/react-router"
 import { TanStackRouterDevtools } from "@tanstack/react-router-devtools"
-import { useEffect } from "react"
+import { useEffect, useState } from "react"
 
 import { getLauncherAuthStatus } from "@/api/launcher-auth"
 import { AppLayout } from "@/components/app-layout"
@@ -30,6 +30,8 @@ const RootLayout = () => {
       (m) => m.routeId === "/launcher-login" || m.routeId === "/launcher-setup",
     )
 
+  const [authError, setAuthError] = useState<string | null>(null)
+
   // Session guard: proactively check auth status on every page load.
   // This catches the case where ?token= auto-login bypassed the login/setup UI.
   useEffect(() => {
@@ -43,12 +45,16 @@ const RootLayout = () => {
         }
       })
       .catch((err: unknown) => {
-        // For real HTTP errors (e.g. 503 when the auth store is unavailable),
-        // redirect to login so the user can re-authenticate rather than being
-        // silently stranded on the dashboard.  Network failures (no response)
-        // are left alone — launcherFetch handles the 401 redirect on real calls.
-        if (err instanceof Error && /^status \d+$/.test(err.message)) {
+        // On 401/403, redirect to login — the session is invalid.
+        // On 5xx (e.g. 503 when the auth store is unavailable) or network errors,
+        // do NOT redirect: a subsequent successful login would loop straight back here.
+        // launcherFetch handles 401 on real API calls regardless.
+        if (err instanceof Error && /^status 40[13]$/.test(err.message)) {
           globalThis.location.assign("/launcher-login")
+        } else {
+          setAuthError(
+            err instanceof Error ? err.message : "Auth service unavailable, please try to delete the launcher-auth.db at picoclaw home directory and restart the application.",
+          )
         }
       })
   }, [isAuthPage])
@@ -70,10 +76,24 @@ const RootLayout = () => {
   }
 
   return (
-    <AppLayout>
-      <Outlet />
-      {import.meta.env.DEV ? <TanStackRouterDevtools /> : null}
-    </AppLayout>
+    <>
+      {authError && (
+        <div className="bg-destructive text-destructive-foreground fixed inset-x-0 top-0 z-[100] flex items-center justify-between px-4 py-2 text-sm shadow-md">
+          <span>Auth service error: {authError}</span>
+          <button
+            className="ml-4 opacity-70 hover:opacity-100"
+            onClick={() => setAuthError(null)}
+            aria-label="Dismiss"
+          >
+            ✕
+          </button>
+        </div>
+      )}
+      <AppLayout>
+        <Outlet />
+        {import.meta.env.DEV ? <TanStackRouterDevtools /> : null}
+      </AppLayout>
+    </>
   )
 }