feat: gear registry — manage bikes/shoes per athlete, set per activity

- 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

bincio/extract/strava_api.py

@@ -150,6 +150,15 @@ def fetch_streams(access_token: str, activity_id: int) -> dict:
     return result if isinstance(result, dict) else {}
 
 
+def fetch_gear(access_token: str, gear_id: str) -> dict:
+    """Fetch gear details for a single gear item. Returns {} on error."""
+    try:
+        result = _api_get(f"{_API_BASE}/gear/{gear_id}", access_token)
+        return result if isinstance(result, dict) else {}
+    except StravaError:
+        return {}
+
+
 # ── Model conversion ───────────────────────────────────────────────────────────
 
 def strava_meta_to_partial(meta: dict) -> ParsedActivity:
@@ -215,4 +224,5 @@ def strava_to_parsed(meta: dict, streams: dict) -> ParsedActivity:
         description=meta.get("description") or None,
         strava_id=str(meta["id"]),
         privacy="unlisted" if is_private else "public",
+        gear=meta.get("_gear_name") or None,
     )