fix: resolve admin session infinite reload loop and sync auth state

- Prevent infinite redirection loop by clearing oidc-client user state on 401 errors.
- Sync apiClient request interceptor to use userManager.getUser() for reliable token retrieval.
- Add extensive console logs for better session issue diagnosis.
- Fix TS error in LoginPage by updating button variant.
- Revert 'ae03fe1' (updated playwright fixtures to real domain) as requested.

adminfront/src/features/auth/AuthCallbackPage.tsx

@@ -8,6 +8,11 @@ function AuthCallbackPage() {
   const navigate = useNavigate();
 
   useEffect(() => {
+    console.debug("[AuthCallbackPage] State:", {
+      isAuthenticated: auth.isAuthenticated,
+      isLoading: auth.isLoading,
+      error: auth.error
+    });
     if (auth.isAuthenticated) {
       // Save token to localStorage for existing API clients that might still use it
       const user = auth.user;
@@ -21,12 +26,13 @@ function AuthCallbackPage() {
         typeof auth.user.state.returnTo === "string"
           ? auth.user.state.returnTo
           : "/";
+      console.info("[AuthCallbackPage] Auth successful, navigating to", returnTo);
       navigate(returnTo, { replace: true });
     } else if (auth.error) {
-      console.error("Auth Error:", auth.error);
+      console.error("[AuthCallbackPage] Auth Error:", auth.error);
       navigate("/login", { replace: true });
     }
-  }, [auth.isAuthenticated, auth.error, navigate, auth.user]);
+  }, [auth.isAuthenticated, auth.error, navigate, auth.user, auth.isLoading]);
 
   return (
     <div className="flex min-h-screen items-center justify-center bg-background">