Fix: No orgs selectable if a user has been removed from an organization

frontend/src/pages/login/select-organization.tsx

@@ -121,6 +121,14 @@ export default function LoginPage() {
     }
   }, [router]);
 
+  // Case: User has no organizations.
+  // This can happen if the user was previously a member, but the organization was deleted or the user was removed.
+  useEffect(() => {
+    if (!organizations.isLoading && organizations.data?.length === 0) {
+      router.push("/org/none");
+    }
+  }, [organizations.isLoading, organizations.data]);
+
   if (userLoading || !user) {
     return <LoadingScreen />;
   }