Implement shared packages (tasks 2.1-2.6)
- @trails-cool/types: Route, Activity, Waypoint, RouteVersion, RouteMetadata
- @trails-cool/gpx: GPX parser (XML→waypoints/tracks/elevation) and generator
with round-trip test, haversine distance, elevation gain/loss computation
- @trails-cool/map: MapView (Leaflet + OSM/OpenTopoMap/CyclOSM layer switcher),
RouteLayer (GeoJSON polyline rendering)
- @trails-cool/ui: Button (primary/secondary/ghost), Input (with label/error),
Card components with Tailwind styling
- @trails-cool/i18n: react-i18next config with English + German translations,
browser language detection, fallback to English
All 13 unit tests pass. Both apps build successfully.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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