- Remove leaflet, leaflet-gpx, @maplibre/maplibre-gl-leaflet and related @types packages
- Add maplibre-gl 5.18.0 as dependency
- Rewrite map.tsx to use MapLibre GL directly (native vector+raster support)
- Rewrite marker.tsx with MapLibre GL HTML markers
- Rewrite GPX track rendering using DOMParser + GeoJSON layers
- Update api.ts, context_menu.ts, index.tsx, map_layer.ts to use GeoMouseEvent
- Update link_context_menu.ts to remove LeafletMouseEvent dependency
- Update types-lib.d.ts to remove Leaflet module augmentation
- Update CSS for MapLibre GL marker classes
- Replace Leaflet marker PNG with inline SVG marker pin

Co-authored-by: eliandoran <21236836+eliandoran@users.noreply.github.com>