Remove on-premise test elements

Removes the Supabase on-premise test-related elements from the login page.

src/hooks/useLogin.ts

@@ -1,5 +1,5 @@
 
-import { useState, useEffect } from "react";
+import { useState } from "react";
 import { useNavigate } from "react-router-dom";
 import { useToast } from "@/hooks/useToast.wrapper";
 import { useAuth } from "@/contexts/auth";