feat(wind): Level 1 — 4×5 viewport grid of wind arrows

- WeatherApiService: batch endpoint getWeatherForecastBatch with
  comma-separated lat/lon → List<WeatherResponse>
- WeatherRepository.fetchWindGrid: chunks 20 points into two calls of 10,
  maps each response to a WindArrow at its returned lat/lon
- MainViewModel.loadWindGrid(bounds): builds a 4×5 grid from visible map
  bounds, calls fetchWindGrid, emits to windGrid StateFlow
- MapHandler.setupWindGridLayer: GeoJSON source + SymbolLayer reusing the
  wind-arrow icon; MapHandler.updateWindGridLayer: pushes feature collection
- MainActivity: stores mapLibreMapRef; calls setupWindGridLayer after style
  loads; addOnCameraIdleListener fires loadWindGrid on every pan/zoom;
  observes windGrid → updateWindGridLayer

https://claude.ai/code/session_01HXPjBsogsJVRwCiekDGkJX

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