fix(tui): make mac copy use pbcopy

ui-tui/src/__tests__/clipboard.test.ts

@@ -1,6 +1,6 @@
 import { describe, expect, it, vi } from 'vitest'
 
-import { readClipboardText } from '../lib/clipboard.js'
+import { readClipboardText, writeClipboardText } from '../lib/clipboard.js'
 
 describe('readClipboardText', () => {
   it('does nothing off macOS', async () => {
@@ -23,3 +23,47 @@ describe('readClipboardText', () => {
     await expect(readClipboardText('darwin', run)).resolves.toBeNull()
   })
 })
+
+describe('writeClipboardText', () => {
+  it('does nothing off macOS', async () => {
+    const start = vi.fn()
+
+    await expect(writeClipboardText('hello', 'linux', start)).resolves.toBe(false)
+    expect(start).not.toHaveBeenCalled()
+  })
+
+  it('writes text to pbcopy on macOS', async () => {
+    const stdin = { end: vi.fn() }
+    const child = {
+      once: vi.fn((event: string, cb: (code?: number) => void) => {
+        if (event === 'close') {
+          cb(0)
+        }
+
+        return child
+      }),
+      stdin
+    }
+    const start = vi.fn().mockReturnValue(child)
+
+    await expect(writeClipboardText('hello world', 'darwin', start as any)).resolves.toBe(true)
+    expect(start).toHaveBeenCalledWith('pbcopy', [], expect.objectContaining({ stdio: ['pipe', 'ignore', 'ignore'], windowsHide: true }))
+    expect(stdin.end).toHaveBeenCalledWith('hello world')
+  })
+
+  it('returns false when pbcopy fails', async () => {
+    const child = {
+      once: vi.fn((event: string, cb: () => void) => {
+        if (event === 'error') {
+          cb()
+        }
+
+        return child
+      }),
+      stdin: { end: vi.fn() }
+    }
+    const start = vi.fn().mockReturnValue(child)
+
+    await expect(writeClipboardText('hello world', 'darwin', start as any)).resolves.toBe(false)
+  })
+})