- Changed the fitness overview path from `/activity` to `/history` and updated related navigation labels to reflect this change.
- Refactored the `FitnessDashboardOverview` component to accept external period control and conditionally display the period selector.
- Integrated the `FitnessDashboardOverview` into the `History` page, enhancing the user experience with consistent terminology and layout.
- Removed the fitness overview from the `ActivityPage` to streamline the interface and focus on activity data collection.
- Added new functions to build fitness dashboard visualizations, including weekly training volume and training type distribution charts.
- Updated the `charts.py` router to include a new endpoint for the fitness dashboard, integrating data from activity metrics.
- Refactored existing activity-related functions to improve modularity and maintainability.
- Updated frontend components to reflect the new fitness terminology and integrate the fitness dashboard overview, enhancing user experience.
