fix: implement i64 serialization for JavaScript compatibility, fixing avatar URL display

web/src/lib/api.ts

@@ -167,7 +167,7 @@ export class BannerApiClient {
     return this.request<User[]>("/admin/users");
   }
 
-  async setUserAdmin(discordId: bigint, isAdmin: boolean): Promise<User> {
+  async setUserAdmin(discordId: string, isAdmin: boolean): Promise<User> {
     const response = await this.fetchFn(`${this.baseUrl}/admin/users/${discordId}/admin`, {
       method: "PUT",
       headers: { "Content-Type": "application/json" },

web/src/routes/admin/users/+page.svelte

@@ -6,7 +6,7 @@ import { Shield, ShieldOff } from "@lucide/svelte";
 
 let users = $state<User[]>([]);
 let error = $state<string | null>(null);
-let updating = $state<bigint | null>(null);
+let updating = $state<string | null>(null);
 
 onMount(async () => {
   try {