fix(frontend): redirect to login client-side after password change

The server action used redirect('/login') which throws a Next.js
internal error, leaving the form stuck in a loading state during
the transition. Move the redirect to the client side with
router.push('/login') so setIsLoading(false) is properly reached
on error, and the navigation happens cleanly after the success toast.

autogpt_platform/frontend/src/app/(platform)/reset-password/actions.ts

@@ -47,7 +47,7 @@ export async function changePassword(password: string) {
       }
 
       await supabase.auth.signOut({ scope: "global" });
-      redirect("/login");
+      return undefined;
     },
   );
 }

autogpt_platform/frontend/src/app/(platform)/reset-password/page.tsx

@@ -129,8 +129,8 @@ function ResetPasswordContent() {
       }
 
       const error = await changePassword(data.password);
-      setIsLoading(false);
       if (error) {
+        setIsLoading(false);
         toast({
           title: "Error",
           description: error,
@@ -143,8 +143,9 @@ function ResetPasswordContent() {
         description: "Password changed successfully. Redirecting to login.",
         variant: "default",
       });
+      router.push("/login");
     },
-    [changePasswordForm, toast],
+    [changePasswordForm, toast, router],
   );
 
   if (isUserLoading) {