feat: add Win32TrayApp and NoOpTray with state management

tests/test_tray.py

@@ -22,3 +22,38 @@ class TestCreateIcon:
         waiting = create_icon(AppState.WAITING)
         recording = create_icon(AppState.RECORDING)
         assert waiting.tobytes() != recording.tobytes()
+
+
+@pytest.mark.skipif(sys.platform != "win32", reason="Tray nur auf Windows")
+class TestWin32TrayApp:
+    def test_set_state_updates_icon(self):
+        from unittest.mock import MagicMock, patch
+        from whisper_local.tray._tray import AppState, Win32TrayApp
+
+        app = Win32TrayApp(on_settings=MagicMock(), on_quit=MagicMock())
+
+        mock_icon = MagicMock()
+        app._icon = mock_icon
+
+        app.set_state(AppState.RECORDING)
+
+        assert mock_icon.icon is not None
+
+    def test_set_state_before_start_is_safe(self):
+        from unittest.mock import MagicMock
+        from whisper_local.tray._tray import AppState, Win32TrayApp
+
+        app = Win32TrayApp(on_settings=MagicMock(), on_quit=MagicMock())
+        app.set_state(AppState.WAITING)  # kein Fehler, _icon ist None
+
+
+class TestNoOpTray:
+    def test_start_does_nothing(self):
+        from whisper_local.tray._tray import AppState, NoOpTray
+        tray = NoOpTray()
+        tray.start()  # kein Fehler
+
+    def test_set_state_does_nothing(self):
+        from whisper_local.tray._tray import AppState, NoOpTray
+        tray = NoOpTray()
+        tray.set_state(AppState.RECORDING)  # kein Fehler