Add shared backend for running dashboard

Align pain chart points vertically by switching to categorical LineChart

Add week navigation to weekly summary section

Sort runs by date within each week before assigning jitter

Sort pain chart points by date instead of x-position

Add connecting lines to pain scatter points and center legend

Show individual run pain values as jittered scatter points

Replace injury tracking dropdown with checkboxes for left/right knee

Clean up chart labels and unify pain chart colours

Add ACWR info tooltip to Next Week Target heading

Revert Add Run form to dropdown for injury selection

Support independent per-location injury tracking

Split pain chart into separate chart per injury location

Add injury pain tracking with per-location during/after metrics

Add single run injury threshold with BJSM info tooltip

Add Y-axis labels to charts (km and load)

Add notes, inline editing, RPE descriptions, decimal inputs, and ACWR recommendations

Add running dashboard with weekly tracking, 10% rule recommendations, and charts

Duplicate from static-templates/react