refactor: enhance TimerPage layout and functionality; update theme and tokens for improved design consistency

- Refactored TimerPage component to improve layout and user experience.
- Updated theme configuration to utilize design tokens for better maintainability.
- Introduced new tokens for colors and typography to align with design principles.
- Simplified state management and improved timer functionality.
- Enhanced accessibility and responsiveness of UI elements.

desktop/pyproject.toml

@@ -8,6 +8,9 @@ requires-python = ">=3.11"
 # so the app starts with the system Python and no virtualenv.
 dependencies = ["PyQt6>=6.6"]
 
+[project.optional-dependencies]
+dev = ["pytest>=8.0"]
+
 [project.scripts]
 kadence-desktop = "kadence_desktop.__main__:main"
 
@@ -17,3 +20,7 @@ build-backend = "hatchling.build"
 
 [tool.hatch.build.targets.wheel]
 packages = ["kadence_desktop"]
+
+[tool.pytest.ini_options]
+pythonpath = ["."]
+testpaths = ["tests"]