Activity CRUD:
- Activity list page (/activities) with date, distance, elevation
- Create activity with GPX upload, description, optional route link
- Activity detail with stats and date
- "Link to Route" action (select from existing routes)
- "Create Route from Activity" action (creates route from GPX)
Server logic in activities.server.ts with async GPX parsing.
Uses ClientDate component for SSR-safe date rendering.
All 6 Group 10 tasks complete.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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