API (gear.py):
- POST /api/gear/{id}/parts
- PATCH /api/gear/{id}/parts/{pid}
- DELETE /api/gear/{id}/parts/{pid}
- POST /api/gear/{id}/parts/{pid}/replacements
- DELETE /api/gear/{id}/parts/{pid}/replacements/{rid}
UI (AthleteView.svelte):
- Gear rows are now accordion-expandable
- Collapsed row shows colored status dots (green/yellow/red) per part
- Expanded section: parts list with km-since-replacement colored by threshold,
Replaced button with date+note form, recent log entries, add-part form
- Contextual suggestion for first part (chain for bikes, shoes for running)
- Edit/delete gear moved into expanded section
- New /api/gear CRUD endpoints (gear.json per user)
- Gear tab in AthleteView (owner-only): add, edit, retire items
- EditDrawer gear field becomes a dropdown when registry has items
- Strava API sync now resolves gear_id → name, adds to registry automatically
- Strava ZIP import reads Gear column from activities.csv
- POST /api/strava/import-gear for one-time backfill from stored originals