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/LoginPage.tsx

@@ -20,10 +20,16 @@ function LoginPage() {
   const shouldAutoLogin = searchParams.get("auto") === "1";
 
   useEffect(() => {
+    console.debug("[LoginPage] Auth state check:", {
+      isAuthenticated: auth.isAuthenticated,
+      isLoading: auth.isLoading,
+      returnTo
+    });
     if (auth.isAuthenticated) {
+      console.info("[LoginPage] User is authenticated, redirecting to", returnTo);
       navigate(returnTo, { replace: true });
     }
-  }, [auth.isAuthenticated, navigate, returnTo]);
+  }, [auth.isAuthenticated, navigate, returnTo, auth.isLoading]);
 
   useEffect(() => {
     if (!shouldAutoLogin) {
@@ -72,8 +78,8 @@ function LoginPage() {
             </div>
             <p className="opacity-90">{auth.error.message}</p>
             <Button
-              variant="link"
-              className="p-0 h-auto text-destructive underline mt-2"
+              variant="ghost"
+              className="p-0 h-auto text-destructive underline mt-2 hover:bg-transparent"
               onClick={() => {
                 window.location.href =
                   window.location.origin + window.location.pathname;