Massive refactor of API

- Switch to function based API
- Anthropic SDK style async generator
- Fully typed with escape hatches for custom models

packages/tui/test/file-browser.ts

@@ -1,6 +1,6 @@
-import { TUI, SelectList } from "../src/index.js";
 import { readdirSync, statSync } from "fs";
 import { join } from "path";
+import { SelectList, TUI } from "../src/index.js";
 
 const ui = new TUI();
 ui.start();
@@ -52,4 +52,4 @@ function showDirectory(path: string) {
 	ui.setFocus(fileList);
 }
 
-showDirectory(currentPath);
+showDirectory(currentPath);