- pnpm add maplibre-gl + -D @types/geojson.
- src/map/core/styles.ts: defaultStyle (OSM raster bootstrap; 2.2
replaces with the basemap-switcher descriptor table).
- src/map/core/map-view.tsx: module-level Map singleton lazily created
on first <MapView> mount, attached to a class="trm-map-host" detached
<div> that React refs append/remove on mount/unmount. Style-data
lifecycle flips mapReady false on every styledata event, polls
loaded() at 33ms intervals, flips ready true once the style is
loaded — the canonical MapLibre style-swap dance.
- Exports getMap()/getMapReady()/subscribeMapReady()/useMapReady (via
useSyncExternalStore for SSR-safe + concurrent-safe reads). getMap()
throws if called pre-mount; the explicit failure mode beats a
null-able top-level export.
- src/routes/_authed/monitor.tsx: new /monitor route, full-viewport
<MapView /> for 2.1 (no children — subsequent tasks plug in here).
- src/routes/_authed/index.tsx: home-page card now links to /monitor.
- eslint.config.js: override for src/map/** + src/live/** disables
react-refresh/only-export-components. Same pattern as the existing
overrides for shadcn primitives and route files.
Deviation: spec sketched a top-level `map` constant export; implemented
as `getMap(): MapLibreMap` (a function) so the singleton stays lazy
until <MapView> mounts. Top-level constant would either force eager
init (breaks SSR/tests) or be nullable (footgun). The function form
throws a clear error if called pre-mount.
Bundle: /monitor lazy chunk is 1MB raw / 274KB gzipped (MapLibre + CSS).
Other routes unaffected. Vite chunk-size warning is harmless.
