perf(client): defer chat persistence dependencies

src/data/repositories/chat_repository_loader.ts

@@ -0,0 +1,13 @@
+import type { IChatRepository } from "./interfaces/ichat_repository";
+
+/**
+ * Loads the browser-only chat repository behind an explicit async boundary.
+ *
+ * The repository owns the Dexie-backed history and media stores. Keeping this
+ * loader separate prevents those stores from entering every route's eager
+ * client graph through shared providers.
+ */
+export async function loadChatRepository(): Promise<IChatRepository> {
+  const { getChatRepository } = await import("./chat_repository");
+  return getChatRepository();
+}