The initial approach (#150) didn't work because:
1. routes.server.ts used parseGpx (sync, needs browser DOMParser)
instead of parseGpxAsync (uses linkedom on Node.js) — GPX parsing
silently failed, so stats AND geom were never populated
2. Drizzle's customType doesn't pass SQL expressions through toDriver
Fixes:
- Switch to parseGpxAsync for all server-side GPX parsing
- Use db.execute() with raw ST_GeomFromGeoJSON SQL after insert
- Remove unused lineStringFromCoords helper from schema
- Share setGeomFromGpx between routes and activities
- Add unit tests for GPX→GeoJSON coordinate extraction
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
