"Jämna varv" and "Stegträning" previously only lived on the admin
Training page. A driver's own personal mobile profile link now offers
the same self-service configure/start/stop flow already used for the
5-minute practice timer there, with live progress computed server-side
from the driver's own share token so raw lap rows and driver IDs never
reach the client.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>