Fix lap spacing and linked session navigation

[ridecontrol]

What changed

• Scale long workout distance values within the map summary so they do not overlap the lap count.
• Add Previous and Next controls to continuation-linked session details.
• Build the complete linear continuation path around the selected session for navigation and full-journey metrics while excluding alternate branches.
• Expand continuation and component coverage and document the linked-session controls.

Why

Long route totals could overflow their grid column and collide with the lap value. Linked multi-day rides also exposed their combined metrics but did not provide direct navigation between the individual sessions.

Impact

Long distance values remain readable on narrow layouts, and riders can move directly through every session in a connected course journey while retaining an accurate full-journey summary.

Validation

• bun run ci
• 377 tests passed
• Responsive browser verification at a 393px viewport