perf(*): bound list queries, batch fetches, harden media downloads

frontend/src/lib/api/endpoints.ts

@@ -303,8 +303,14 @@ export function getMessageLinks(
   });
 }
 
-export function getChatCalendar(chatId: number): Promise<DayCount[]> {
-  return request<DayCount[]>(`/chats/${chatId}/calendar`, { account: true });
+export function getChatCalendar(
+  chatId: number,
+  range: { date_from?: string; date_to?: string } = {}
+): Promise<DayCount[]> {
+  return request<DayCount[]>(`/chats/${chatId}/calendar`, {
+    account: true,
+    query: { ...range },
+  });
 }
 
 export function getMessageAt(chatId: number, date: string): Promise<MessageAt> {
@@ -334,6 +340,16 @@ export function getPeers(ids: number[]): Promise<PeerView[]> {
   });
 }
 
+export function getChatsBatch(ids: number[]): Promise<Chat[]> {
+  if (ids.length === 0) {
+    return Promise.resolve([]);
+  }
+  return request<Chat[]>("/chats/batch", {
+    account: true,
+    query: { ids: ids.join(",") },
+  });
+}
+
 export function enrichChat(chatId: number): Promise<{ job_id: number }> {
   return request<{ job_id: number }>(`/chats/${chatId}/enrich`, {
     method: "POST",