refactor(errors): extract top-level error handling into shared utility

index.ts

@@ -2,11 +2,10 @@
 import util from "node:util";
 import { createOpenAICompatible } from "@ai-sdk/openai-compatible";
 import { streamText } from "ai";
-import chalk from "chalk";
-import wrapAnsi from "wrap-ansi";
 
 import { initConfig, loadConfig } from "./src/config";
 import { Conversation } from "./src/conversation";
+import { handleTopLevel } from "./src/errors";
 import Renderer from "./src/render";
 
 async function main() {
@@ -104,10 +103,4 @@ Review the above diff for any potential bugs, best practices, performance issues
   await renderer.renderStats(totalUsage);
 }
 
-main().catch((err) => {
-  if ("message" in err) {
-    const [columns] = process.stderr.getWindowSize();
-    console.error(wrapAnsi(chalk.red(err.message), columns));
-  } else console.log(err);
-  process.exit(1);
-});
+main().catch(handleTopLevel);