feat(assets): add DeepSeek assistant with streaming results and voice input

src/auth/api-client.ts

@@ -6,7 +6,7 @@ export function setTokenGetter(fn: () => string | null) {
   tokenGetter = fn;
 }
 
-export async function fetchJson<T>(url: string, options?: RequestInit): Promise<T> {
+export async function fetchAuthenticated(url: string, options?: RequestInit): Promise<Response> {
   const token = tokenGetter();
   const res = await fetch(url, {
     ...options,
@@ -19,6 +19,11 @@ export async function fetchJson<T>(url: string, options?: RequestInit): Promise<
     window.dispatchEvent(new CustomEvent('auth:unauthorized'));
     throw new Error('Unauthorized');
   }
+  return res;
+}
+
+export async function fetchJson<T>(url: string, options?: RequestInit): Promise<T> {
+  const res = await fetchAuthenticated(url, options);
   if (!res.ok) throw new Error(`API error: ${res.status} ${res.statusText}`);
   return res.json();
 }