feat: hide cursor on mount, show on unmount (matching Ink)

Write ESC[?25l to stdout after mount and ESC[?25h during teardown,
matching Ink's cursor management. Only active in production mode
(debug: false) to avoid interfering with test streams.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/runtime-tests/integration/lifecycle/cursor.test.tsx

@@ -0,0 +1,43 @@
+import { defineComponent, nextTick } from "vue";
+import { expect, test } from "vite-plus/test";
+import { createApp, Text } from "@vue-tui/runtime";
+import { PassThrough } from "node:stream";
+
+function makeTtyStream() {
+  const stream = new PassThrough() as unknown as NodeJS.WriteStream & { chunks: string[] };
+  Object.assign(stream, { isTTY: true, columns: 80, rows: 24 });
+  stream.chunks = [];
+  (stream as unknown as PassThrough).on("data", (chunk: Buffer) =>
+    stream.chunks.push(chunk.toString()),
+  );
+  return stream;
+}
+
+test("mount hides cursor, unmount shows cursor", async () => {
+  const stdout = makeTtyStream();
+  const stderr = makeTtyStream();
+  const stdin = new PassThrough() as unknown as NodeJS.ReadStream;
+  Object.assign(stdin, {
+    isTTY: true,
+    setRawMode() {
+      return stdin;
+    },
+  });
+
+  const App = defineComponent(() => () => <Text>hello</Text>);
+
+  const app = createApp(App);
+  app.mount({ stdout, stdin, stderr, debug: false, exitOnCtrlC: false });
+  await nextTick();
+
+  // Cursor should be hidden after mount
+  const afterMount = stdout.chunks.join("");
+  expect(afterMount).toContain("\x1b[?25l");
+
+  app.unmount();
+  await nextTick();
+
+  // Cursor should be shown after unmount
+  const afterUnmount = stdout.chunks.join("");
+  expect(afterUnmount).toContain("\x1b[?25h");
+});

packages/runtime/src/render.ts

@@ -74,6 +74,10 @@ export function createApp(root: Component, rootProps?: RootProps | null): TuiApp
       // Vue's unmount may throw on double-unmount; swallow for idempotency.
     }
     if (mountedWriter && !mountedDebug) mountedWriter.done();
+    // Show cursor on unmount (matching Ink).
+    if (!mountedDebug && mountedAppContext) {
+      mountedAppContext.stdout.write("\x1b[?25h");
+    }
     if (mountedRoot) detachYoga(mountedRoot);
     if (mountedResizeHandler && mountedAppContext) {
       mountedAppContext.stdout.off("resize", mountedResizeHandler);
@@ -204,6 +208,12 @@ export function createApp(root: Component, rootProps?: RootProps | null): TuiApp
       mountedRawMode = true;
     }
 
+    // Hide cursor on mount (matching Ink). Only in production mode — in
+    // debug/test mode the stream may not be a real TTY.
+    if (!debug) {
+      stdout.write("\x1b[?25l");
+    }
+
     // Built-in Tab / Shift+Tab / Escape focus navigation (matches Ink).
     // Placed AFTER mount so a sync mount failure doesn't leak the listener.
     const focusInputListener = (chunk: Buffer | string) => {