feat: add fullscreen TUI mode with Ink React components

src/frontends/tui/fullscreen.ts

@@ -0,0 +1,27 @@
+import React from 'react';
+import { render } from 'ink';
+import { App } from './components/index.js';
+import type { ManagedSession } from '../../session/index.js';
+import type { ModelClient } from '../../models/types.js';
+
+export interface FullscreenTuiConfig {
+  session: ManagedSession;
+  modelClient: ModelClient;
+  systemPrompt: string;
+  model: string;
+  onExit?: () => void;
+}
+
+export async function startFullscreenTui(config: FullscreenTuiConfig): Promise<void> {
+  const { waitUntilExit } = render(
+    React.createElement(App, {
+      session: config.session,
+      modelClient: config.modelClient,
+      systemPrompt: config.systemPrompt,
+      model: config.model,
+      onExit: config.onExit,
+    })
+  );
+
+  await waitUntilExit();
+}