Fix Google OAuth redirect URL to include basePath

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/components/auth/google-button.tsx

@@ -38,7 +38,7 @@ export function GoogleSignInButton() {
     const { error } = await supabase.auth.signInWithOAuth({
       provider: 'google',
       options: {
-        redirectTo: `${window.location.origin}/auth/callback`,
+        redirectTo: `${window.location.origin}/leopost/auth/callback/`,
         queryParams: {
           access_type: 'offline',
           prompt: 'consent',