Merge origin/main: Google Street View, KartaView and Panoramax on the slim Street Level

Main gained three imagery providers (Google Street View, KartaView,
Panoramax), shared line-coverage, cone and photo-viewer modules, one source
lit at a time and the translated interface. Their shared modules still
carried what this branch removes, so the merge ports them onto it:

- lineCoverage.js is this branch's coverage.js made provider-neutral
  (draped lines near the ground only, the selection drawn over them, key
  and rate-limit blocking); sequenceCones.js is sequences.js the same way.
  Mapillary, KartaView and Panoramax all build on them; Mapillary moves
  back to providers/mapillary/ beside the others.
- No ground casting, mesh sampling, surface modes, FOLLOW, legend, prewarm,
  orbit overview points (Panoramax's density dots included), stale-tile
  swaps or water-filled point budget come back.
- Kept from main because the new providers need them: requiresMapStack and
  attachMapStackController (Street View on Google 3D only), ground clicks,
  openNearest with an optional provider nearestImage, openImage {frame},
  reportError, the view-cone marker (now an SVG glyph), filters /
  coverageLabel / sinceBasis, OPEN STREET VIEW, keyAlternatives and i18n.
- photoViewer.js treats the viewer as expanded when its wrap is full screen
  or the iPhone popover, as EXPAND now is.
- The fixture browser gate keeps its 8 steps and adds one each for
  KartaView and Panoramax; catalogs, docs, boundaries and format scope
  follow.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/layers/streetLevel/marker.test.mjs

@@ -31,6 +31,7 @@ function setup() {
       collection: {
         show: true,
         add: (options) => ({ ...options }),
+        remove() {},
         removeAll() {},
       },
       billboard: null,
@@ -87,3 +88,25 @@ test('the marker is clamped to the ground and turned to the bearing', () => {
   assert.ok(Math.abs(Cesium.Math.toDegrees(placed.longitude) + 121.5) < 1e-9);
   assert.equal(billboard.rotation, -Cesium.Math.toRadians(90));
 });
+
+test('a Street View photo gets a blue view cone; a Mapillary photo GEV\u2019s pin', () => {
+  const { state, marker } = setup();
+  const removed = [];
+  state.marker.collection.remove = (billboard) => removed.push(billboard);
+  const streetView = { kind: 'view-cone', color: '#4285f4' };
+  marker.set({ lon: -121.49, lat: 38.58 }, 45, streetView);
+  const cone = state.marker.billboard;
+  assert.equal(cone.imageId, 'sl-position:view-cone:#4285f4');
+  assert.equal(
+    cone.rotation,
+    -Cesium.Math.toRadians(45),
+    'it turns with the view',
+  );
+  // Dragging the panorama keeps the look and the billboard.
+  marker.set({ lon: -121.49, lat: 38.58 }, 90, streetView);
+  assert.equal(state.marker.billboard, cone);
+  // A Mapillary photo next (its provider has no marker): the pin.
+  marker.set({ lon: -121.49, lat: 38.58 }, 90, undefined);
+  assert.equal(state.marker.billboard.imageId, 'sl-position:pin');
+  assert.deepEqual(removed, [cone]);
+});