Implement mobile route editor with MapLibre and BRouter routing
Route editing (Phase 3.3):
- useRouteEditor hook: waypoint state, add/move/delete, BRouter
routing via Journal API proxy, GPX generation, save to API
- RouteMap component: MapLibre Native with OSM raster tiles,
route polyline (ShapeSource + LineLayer), waypoint markers
(MarkerView), long-press to add waypoints, computing indicator
- WaypointSheet: bottom sheet for waypoint actions — delete with
confirmation, overnight stop toggle, coordinates display
- Route detail screen: view mode (map preview + stats) and edit
mode (full-screen map with save button)
- Unsaved changes guard on navigation (beforeRemove listener)
- Smart waypoint insertion at nearest route segment
- Waypoint extraction from GPX via regex (sync, no DOM needed)
Adds DOM.Iterable to mobile tsconfig for gpx package compat.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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