Fix admin user approval: remove .single() and add RLS note

Supabase returns 0 rows when RLS blocks the update result.
Removed .select().single() from approve/revoke/role change APIs.
Admin needs RLS policy to update other users' profiles.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: Yushin-L

src/lib/admin/api.ts

@@ -25,43 +25,34 @@ export async function getAllProfiles(): Promise<Profile[]> {
   return (data as Profile[]) ?? [];
 }
 
-export async function approveUser(userId: string): Promise<Profile> {
-  const { data, error } = await supabase
+export async function approveUser(userId: string): Promise<void> {
+  const { error } = await supabase
     .from("profiles")
     .update({ is_approved: true })
-    .eq("id", userId)
-    .select()
-    .single();
+    .eq("id", userId);
 
   if (error) throw error;
-  return data as Profile;
 }
 
-export async function revokeUser(userId: string): Promise<Profile> {
-  const { data, error } = await supabase
+export async function revokeUser(userId: string): Promise<void> {
+  const { error } = await supabase
     .from("profiles")
     .update({ is_approved: false })
-    .eq("id", userId)
-    .select()
-    .single();
+    .eq("id", userId);
 
   if (error) throw error;
-  return data as Profile;
 }
 
 export async function updateUserRole(
   userId: string,
   role: Profile["role"]
-): Promise<Profile> {
-  const { data, error } = await supabase
+): Promise<void> {
+  const { error } = await supabase
     .from("profiles")
     .update({ role })
-    .eq("id", userId)
-    .select()
-    .single();
+    .eq("id", userId);
 
   if (error) throw error;
-  return data as Profile;
 }
 
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