Classify the Navara launch pad zone onto terrain and 3D tiles with Cesium's fill, rim and emission

The zone was a flat disc at ellipsoid height in Navara's opaque scene: it floated over low pads and sank under raised ground or 3D tiles, with hard edges and an unlit rim. A screen-space pass now paints the ground pixels within the radius of the pad from the scene depth, as Cesium's GroundPrimitive classifies them, using one style shared by both engines (LAUNCH_PAD_ZONE_STYLE).

scripts/package-boundaries.json

@@ -3689,6 +3689,7 @@
       "src/layers/localAdsb/render/navara.js",
       "src/layers/vessels/render/navara.js",
       "src/layers/launches/render/navara.js",
+      "src/layers/launches/render/navaraPadGround.js",
       "src/layers/satellites/render/navara.js",
       "src/layers/shared/render/engineView.js",
       "src/celestialRing/render/cesium.js",