release: bump version to 0.59.0

docs/technical/en/earth-frontend-context.md

@@ -216,6 +216,8 @@ The real satellite altitude preference is persisted by `controls.js`, while the
 
 SGP4 propagation returns an inertial-frame position, so it must not be drawn directly as Earth-fixed longitude / latitude. `satellites.js` uses `gstime` to convert ECI/TEME positions to ECF, then maps that result into the same Three.js axes as `latLonToVector3()`. Satellite dots and short trails use Earth-fixed coordinates for each sample time, representing the object's current position relative to the globe surface. The locked predicted orbit uses the `gstime` from the lock moment for the whole future orbit, projecting the inertial orbit plane onto the current globe pose; that keeps the line closed and keeps the visual orbit inclination aligned with the details card. Fallback predicted orbits must also use a real RAAN + inclination orbital-plane formula, not treat inclination as a constant latitude.
 
+Boundary precision is stored separately by `country-boundaries.js` under `planet.earth.boundaries.highPrecisionEnabled`. When high precision is off, Earth keeps using the bundled low-precision `countries-admin0.min.geojson` fallback even if high-precision manifest/PMTiles files exist locally. When high precision is on but the artifact is missing, the Earth toolbar settings call `/api/v1/earth/boundaries/build` and poll progress. After success, `reloadCountryBoundaries()` hot-swaps the boundary layer without refreshing the page. Boundary hover is independent from interactable hover: a country polygon remains highlighted whenever the surface coordinate is inside it, while the tooltip can still prioritize a satellite, vessel, BGP marker, or other interactable.
+
 ## Current Terrain Pipeline
 
 1. `terrain.js` creates a sphere geometry with enough segments