fix(pav-5): add refreshUser to AuthContext for OAuth callback

AuthCallback now re-fetches /auth/me after OAuth redirect to pick up
the newly created session, instead of relying on the initial mount
fetch which runs before the session exists.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: 2 people

frontend/src/context/AuthContext.tsx

@@ -18,6 +18,7 @@ interface AuthContextData {
   isLoading: boolean;
   login: (credentials: { email: string; password: string }) => Promise<void>;
   logout: () => Promise<void>;
+  refreshUser: () => Promise<void>;
 }
 
 const AuthContext = createContext<AuthContextData>({} as AuthContextData);
@@ -50,8 +51,20 @@ export function AuthProvider({ children }: { children: ReactNode }) {
     setUser(null);
   }
 
+  async function refreshUser() {
+    setIsLoading(true);
+    try {
+      const res = await api.get("/auth/me");
+      setUser(res.data.user ?? { id: res.data.userId, email: "" });
+    } catch {
+      setUser(null);
+    } finally {
+      setIsLoading(false);
+    }
+  }
+
   return (
-    <AuthContext.Provider value={{ user, isLoading, login, logout }}>
+    <AuthContext.Provider value={{ user, isLoading, login, logout, refreshUser }}>
       {children}
     </AuthContext.Provider>
   );

frontend/src/pages/auth/AuthCallback.tsx

@@ -1,14 +1,22 @@
-import { useEffect } from "react";
+import { useEffect, useRef } from "react";
 import { useNavigate } from "react-router-dom";
 import { useAuth } from "@/context/AuthContext";
 import Loading from "@/Loading";
 
 export default function AuthCallback() {
-  const { user, isLoading } = useAuth();
+  const { user, isLoading, refreshUser } = useAuth();
   const navigate = useNavigate();
+  const hasRefreshed = useRef(false);
 
   useEffect(() => {
-    if (isLoading) return;
+    if (!hasRefreshed.current) {
+      hasRefreshed.current = true;
+      refreshUser();
+    }
+  }, [refreshUser]);
+
+  useEffect(() => {
+    if (isLoading || !hasRefreshed.current) return;
 
     if (user) {
       navigate("/app", { replace: true });