feat: add Win32 inserter backend with clipboard + Ctrl+V

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/test_inserter.py

@@ -60,3 +60,45 @@ class TestWaylandInserter:
             await inserter.insert("Test")
 
         assert call_count == 4
+
+
+class TestWin32Inserter:
+    @pytest.mark.asyncio
+    @patch("whisper_local.inserter._win32.keyboard_controller")
+    @patch("whisper_local.inserter._win32.Win32Inserter._get_clipboard", return_value="alter clipboard")
+    @patch("whisper_local.inserter._win32.Win32Inserter._set_clipboard")
+    async def test_insert_text(self, mock_set, mock_get, mock_kb):
+        from whisper_local.inserter._win32 import Win32Inserter
+
+        inserter = Win32Inserter()
+        await inserter.insert("Hallo Welt")
+
+        # Clipboard wurde gesichert
+        mock_get.assert_called_once()
+        # Text wurde in Clipboard gesetzt, dann Ctrl+V, dann Restore
+        assert mock_set.call_count == 2
+        mock_set.assert_any_call("Hallo Welt")
+        mock_set.assert_any_call("alter clipboard")
+
+    @pytest.mark.asyncio
+    async def test_insert_empty_does_nothing(self):
+        from whisper_local.inserter._win32 import Win32Inserter
+
+        inserter = Win32Inserter()
+        await inserter.insert("")
+
+    @pytest.mark.asyncio
+    @patch("whisper_local.inserter._win32.keyboard_controller")
+    @patch("whisper_local.inserter._win32.Win32Inserter._get_clipboard", return_value="original")
+    @patch("whisper_local.inserter._win32.Win32Inserter._set_clipboard")
+    async def test_clipboard_restored_on_error(self, mock_set, mock_get, mock_kb):
+        from whisper_local.inserter._win32 import Win32Inserter
+
+        mock_kb.press.side_effect = OSError("keyboard error")
+
+        inserter = Win32Inserter()
+        with pytest.raises(OSError):
+            await inserter.insert("Test")
+
+        # Clipboard muss trotzdem wiederhergestellt werden
+        mock_set.assert_called_with("original")