New graphs

- Add a detailed summary visual for the most recent run.
  - Show key metrics *per kilometre*:
    - Cadence
    - Stride length
    - Pace
    - Elevation
  - Present as a clean multi-line chart for easy trend comparison.
- Add a weekly breakdown alongside the existing monthly distance statistics.
  - Include an *average weekly mileage* indicator to reflect current training load more accurately.