feat: add create_tray() factory with platform dispatch

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

tests/test_tray.py

@@ -242,3 +242,29 @@ class TestSettingsDialog:
         if captured_save_fn:
             captured_save_fn[0]()
             assert len(saved_configs) == 1
+
+
+class TestCreateTray:
+    @pytest.mark.skipif(sys.platform != "win32", reason="Win32TrayApp nur auf Windows")
+    def test_returns_win32_tray_on_windows(self):
+        from unittest.mock import MagicMock
+        from whisper_local.tray import create_tray
+        from whisper_local.tray._tray import Win32TrayApp
+
+        tray = create_tray(on_settings=MagicMock(), on_quit=MagicMock())
+        assert isinstance(tray, Win32TrayApp)
+
+    @pytest.mark.skipif(sys.platform == "win32", reason="NoOpTray nur auf nicht-Windows")
+    def test_returns_noop_tray_on_non_windows(self):
+        from unittest.mock import MagicMock
+        from whisper_local.tray import create_tray
+        from whisper_local.tray._tray import NoOpTray
+
+        tray = create_tray(on_settings=MagicMock(), on_quit=MagicMock())
+        assert isinstance(tray, NoOpTray)
+
+    def test_appstate_exported_from_package(self):
+        from whisper_local.tray import AppState
+        assert AppState.WAITING is not None
+        assert AppState.RECORDING is not None
+        assert AppState.TRANSCRIBING is not None