fix(tui): restore clipboard hotkeys in clarify mode

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

@@ -0,0 +1,29 @@
+import { describe, expect, it, vi } from 'vitest'
+
+import { readClipboardText } from '../lib/clipboard.js'
+
+describe('readClipboardText', () => {
+  it('does nothing off macOS', () => {
+    const run = vi.fn()
+
+    expect(readClipboardText('linux', run)).toBeNull()
+    expect(run).not.toHaveBeenCalled()
+  })
+
+  it('reads text from pbpaste on macOS', () => {
+    const run = vi.fn().mockReturnValue({ status: 0, stdout: 'hello world\n' })
+
+    expect(readClipboardText('darwin', run)).toBe('hello world\n')
+    expect(run).toHaveBeenCalledWith(
+      'pbpaste',
+      [],
+      expect.objectContaining({ encoding: 'utf8', stdio: ['ignore', 'pipe', 'ignore'] })
+    )
+  })
+
+  it('returns null when pbpaste fails', () => {
+    const run = vi.fn().mockReturnValue({ status: 1, stdout: '' })
+
+    expect(readClipboardText('darwin', run)).toBeNull()
+  })
+})