refactor: Replicate Drop's authentication system exactly

app/signup/page.tsx

@@ -1,14 +1,13 @@
 'use client'
 
 import { useEffect } from 'react'
-import { initiateOAuthFlow } from '@/lib/api/oauth'
+import { initiateSignupFlow } from '@/lib/api/oauth'
 import LoadingOverlay from '@/components/LoadingOverlay'
 
 export default function SignupPage() {
   useEffect(() => {
-    // * Immediately initiate OAuth flow when page loads
-    // * The auth service will handle showing signup vs login
-    initiateOAuthFlow()
+    // * Immediately initiate signup flow when page loads
+    initiateSignupFlow()
   }, [])
 
   return (