feat: Refactor playlist management, error handling, and testing infrastructure

- Improved playlist item handling with pagination, error logging, and dedicated request hooks.
- Consolidated reusable helpers for track ID normalization, playlist validation, and removal logic.
- Enhanced error handling by introducing `PlaylistNotFound` and `UserNotAuthenticated` exceptions.
- Refined Pytest `qapp` fixture for headless CI compatibility and session-scoped reuse.
- Replaced redundant fixtures in multiple test files for consistency.
- Improved playlist management GUI with detailed debug logging for notifications and operations.
- Added `deptry` configuration to handle transitive dependencies and ignored exclusions.
- Updated Pytest and Tox configurations for consistent environment setup during CI/CD runs.

1 files changed, 0 insertions, 9 deletions

diff --git a/tests/test_dialog_preferences_integration.py b/tests/test_dialog_preferences_integration.py
index b7df74d..1975a6e 100644
--- a/tests/test_dialog_preferences_integration.py
+++ b/tests/test_dialog_preferences_integration.py
@@ -10,15 +10,6 @@ from tidal_dl_ng.dialog import DialogPreferences
 
 
 @pytest.fixture
-def qapp():
-    """Create QApplication instance for tests."""
-    app = QtWidgets.QApplication.instance()
-    if app is None:
-        app = QtWidgets.QApplication([])
-    yield app
-
-
-@pytest.fixture
 def mock_settings():
     """Create a mock Settings object with all required attributes."""
     settings = Mock(spec=Settings)