Allow admins to assign the creator role

src/app/api/admin/users/[id]/route.ts

@@ -39,7 +39,7 @@ export async function POST(req: Request, ctx: { params: Promise<{ id: string }>
     }
     case "role": {
       const r = body.value as Role;
-      if (!["admin", "learner"].includes(r))
+      if (!["admin", "learner", "creator"].includes(r))
         return NextResponse.json({ error: "Invalid role." }, { status: 400 });
       // Guard: don't let an admin demote the last remaining admin (themselves included).
       if (target.role === "admin" && r !== "admin") {
@@ -49,6 +49,4 @@ export async function POST(req: Request, ctx: { params: Promise<{ id: string }>
       return NextResponse.json({ ok: true });
     }
     default:
-      return NextResponse.json({ error: "Unknown action." }, { status: 400 });
-  }
-}
+      return NextResponse.json({ error: "Unknown action." }, { status: 400