refactor: extract config and conversation handling into separate modules

src/conversation/index.ts

@@ -0,0 +1,24 @@
+import os from "node:os";
+import type { ModelMessage } from "ai";
+
+const home = os.homedir();
+export const convoFile = Bun.file(`${home}/.aicl_convo.json`);
+
+export interface Conversation {
+  model: string;
+  messages: ModelMessage[];
+}
+
+export async function loadConversation(
+  defaultModel: string,
+): Promise<Conversation> {
+  try {
+    return await convoFile.json();
+  } catch {
+    return { model: defaultModel, messages: [] };
+  }
+}
+
+export async function saveConversation(convo: Conversation): Promise<void> {
+  await convoFile.write(JSON.stringify(convo));
+}