refactor(streetLevel,traffic,transit,firms,installations,radio,bikeshare,cables,detection): take vector maths from src/geo

Street level view/cameraFollow/groundClick/index, traffic footprint/viewport/ingestion, transit viewport/trails/state/rendering, FIRMS state/viewport, installations controls/viewport/state, radio queries/navigation/state, bikeshare viewport, submarine cable overlay and data/detection now use src/geo for Math, Cartesian2/3, Cartographic and WGS84 maths. Cesium stays for Rectangle, Ray, BoundingSphere, HeadingPitchRange, EasingFunction, EllipsoidGeodesic, EllipsoidalOccluder and the Ellipsoids passed into Cesium (pickEllipsoid, occluders). traffic/state.js keeps its Cesium lerp scratch (written per frame by Cesium.Cartesian3.lerp in animation.js; a geo scratch cost +4-7% there) and traffic/timing.js stays on Cesium (a test keeps it source-equivalent to model.parseRoads, outside this batch). street-level-layer, traffic-layer, installations-layer, bikeshare-layer and submarine-cables own the src/geo files.

src/layers/traffic/ingestion.js

@@ -1,4 +1,4 @@
-import * as Cesium from 'cesium';
+import * as geo from '../../geo/index.js';
 import { requestWithDeadline } from '../../sources/requestDeadline.js';
 import { resolveRoadMode, ROAD_SOURCE_LABELS } from './roadModes.js';
 import { phaseTiming } from '../../sources/phaseTiming.js';
@@ -271,7 +271,7 @@ export function createIngestion({
     const centerLat = (clamped.south + clamped.north) / 2;
     const centerLon = (clamped.west + clamped.east) / 2;
     const scene = layerState._viewer?.scene;
-    const location = Cesium.Cartographic.fromDegrees(centerLon, centerLat);
+    const location = geo.cartographic.fromDegrees(centerLon, centerLat);
     let estimated = services.ground?.cachedGroundFloor?.(centerLat, centerLon);
     if (!Number.isFinite(estimated)) {
       try {