feat: add stop() method to HotkeyListener protocol and PynputHotkeyListener

tests/test_hotkey.py

@@ -112,3 +112,18 @@ class TestPynputHotkeyListener:
         # Erneutes Release ohne Press — wird ignoriert
         listener._on_release(Key.f12)
         assert listener._loop.call_soon_threadsafe.call_count == 2
+
+
+class TestPynputHotkeyListenerStop:
+    @pytest.mark.asyncio
+    async def test_stop_ends_listen(self):
+        from whisper_local.hotkey._pynput import PynputHotkeyListener
+        from unittest.mock import patch, MagicMock
+        listener = PynputHotkeyListener("KEY_F12")
+
+        with patch("whisper_local.hotkey._pynput.Listener") as mock_listener_cls:
+            mock_listener_cls.return_value = MagicMock()
+            listen_task = asyncio.create_task(listener.listen())
+            await asyncio.sleep(0)   # Loop einen Schritt weiter
+            listener.stop()
+            await asyncio.wait_for(listen_task, timeout=1.0)