feat: AddTempLayer plugin (WMS/WMTS/XYZ/GeoJSON) + core layer-add bus

[BhattaraiSijan]

Purpose

Add an AddTempLayer plugin — "Add layer from URL" — letting users drop an external WMS / WMTS / XYZ / GeoJSON layer onto the map for the current session, plus the core event-bus and rendering support it needs. Built to the monorepo tool pattern: a portable lib/ of presentational React components with all MMGIS coupling isolated in adapters/, communicating with the core over the window.mmgisAPI event bus only.

Proposed Changes

• [ADD] AddTempLayer plugin (monorepo pattern):
  • lib/ (portable): AddTempLayerPanel (trigger + form state) and AddLayerModal (presentational), utils/url (validateUrl, detectLayerType), utils/icons, BEM blocks-* classes, Path A --theme-* styling.
  • adapters/buildLayerObj (URL → MMGIS layer object), MMGISAddTempLayerAdapter (bus bridge), thin AddTempLayerTool (createRoot), config.json with modern-layout metadata.
• [ADD] Core bus channels layers:addLayer / layers:removeLayer (Layers_.js), backed by mmgisAPI.addLayer/removeLayer — session-only, in-memory add via resetConfig + modifyLayer (lost on reload).
• [ADD] WMS / WMTS rendering support:
  • DeckGL: WMSLayer branch in DeckGLHelpers (with parseWmsUrl) selected when tileformat === 'wms'; tileformat threaded through TileLayerOptions and the deck tile call in Map_.js.
  • Leaflet: WMS already supported via WMSColorFilter.
  • WMTS-KVP is rewritten plugin-side into a {z}/{y}/{x} template so it renders through the standard template-tile path in both engines.
• [CHANGE] layers:listChanged event replaces the direct LayersTool destroy/make on layer mutation, so any subscriber (modern or classic layout) can react — decoupled.
• [CHANGE] validateUrl rejects internal whitespace, guarding against two URLs pasted into one field.

Issues

• Add external service layer plugin

Testing

• npm run typecheck → 0 errors.

• Browser (DeckGL engine), verified end-to-end per type — add one URL at a time:

  XYZ

  https://tile.openstreetmap.org/{z}/{x}/{y}.png
  

  WMS (needs a LAYERS param)

  https://ows.terrestris.de/osm/service?SERVICE=WMS&REQUEST=GetMap&LAYERS=OSM-WMS
  

  WMTS — REST template

  https://gibs.earthdata.nasa.gov/wmts/epsg3857/best/BlueMarble_ShadedRelief/default/GoogleMapsCompatible_Level8/{z}/{y}/{x}.jpeg
  

  WMTS — KVP (exercises the KVP→template rewrite)

  https://gibs.earthdata.nasa.gov/wmts/epsg3857/best/wmts.cgi?SERVICE=WMTS&REQUEST=GetTile&VERSION=1.0.0&LAYER=BlueMarble_ShadedRelief&STYLE=default&TILEMATRIXSET=GoogleMapsCompatible_Level8&FORMAT=image/jpeg
  

  GeoJSON (CORS-enabled host)

  https://raw.githubusercontent.com/PublicaMundi/MappingAPI/master/data/geojson/countries.geojson
  

[github-actions]

✅ Version Already Updated

This PR includes a manual version update to 4.2.9-20260211

No automatic version bump needed.