Ignore local storage; admin users NIP-05, media, events, footer updates

- Add /storage/ and /backend/storage/ to .gitignore
- Track meetup time helper, logo asset, and assorted frontend/backend fixes

frontend/lib/api.ts

@@ -11,7 +11,7 @@ async function request<T>(path: string, options?: RequestInit): Promise<T> {
   const res = await fetch(apiUrl(path), { ...options, headers });
   if (!res.ok) {
     const error = await res.json().catch(() => ({ message: "Request failed" }));
-    throw new Error(error.message || `HTTP ${res.status}`);
+    throw new Error(error.message || error.error || `HTTP ${res.status}`);
   }
   return res.json();
 }
@@ -88,6 +88,11 @@ export const api = {
     request<any>("/users/promote", { method: "POST", body: JSON.stringify({ pubkey }) }),
   demoteUser: (pubkey: string) =>
     request<any>("/users/demote", { method: "POST", body: JSON.stringify({ pubkey }) }),
+  updateUserUsername: (pubkey: string, username: string) =>
+    request<any>(`/users/${encodeURIComponent(pubkey)}`, {
+      method: "PATCH",
+      body: JSON.stringify({ username }),
+    }),
 
   // Categories
   getCategories: () => request<any[]>("/categories"),