fix(street-level): keep cones on low ground, and gekh's P3s

From gekh's review of db79027, each with a test that fails before:

- P2: image cones and the photo marker no longer disappear where the
  ground lies below the WGS84 ellipsoid (NYC -22 m, Colombo -95 m). The
  horizon cull's occluder is WGS84 shrunk by 1 km (HORIZON_CULL_DEPTH_M),
  below any real surface, so a camera near or under the ellipsoid no
  longer treats every lower point as behind the horizon; the far side of
  the Earth is still hidden from orbit (tested).
- Mesh range across the date line: the camera's longitude is taken to the
  box's side of +-180 before clamping (meshBoxInRange), so a tile just
  across the line is not measured from its far edge.
- MapillaryJS no longer tracks window resizes (trackResize: false): the
  panel's ResizeObserver resizes the viewer and skips it while hidden, so
  a window resize after closing a photo cannot ask for a tile at z=NaN.
- A key-less install sends no tile requests before the key status is
  known: coverage waits for the first status answer and the provider
  refreshes it once the status lands.
- constructCatalog takes the source method list from MAPILLARY_SOURCE_
  METHODS; sequences.js imports view.js once; the provider's unused
  re-exports are gone.

Verified: unit 5970 pass; strict fixture gate on a production build 28 ok
+ 2 "no Google 3D" skips and the panel gate 6/6 (QA_FAIL_ON_RETRY=1);
live gate with a real token 25 ok + 3 fixture-only skips.

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

src/layers/streetLevel/providers/mapillary/index.js

@@ -16,8 +16,6 @@ import {
   PICK_PREFIX,
 } from './policy.js';
 
-export { MAPILLARY_PROVIDER_ID, mapillaryImageUrl } from './policy.js';
-
 /** Per-provider mutable state, created once per `create()`. */
 function createProviderState(context) {
   return {
@@ -25,6 +23,11 @@ function createProviderState(context) {
     services: context.services,
     viewer: null,
     keyRequired: false,
+    /**
+     * False until the first status answer: coverage asks for nothing before
+     * it, so a key-less install never sends tile requests that get 503.
+     */
+    statusKnown: false,
     /** Mapillary refused the configured token: nothing is requested until re-enabled. */
     keyRejected: false,
     status: null,
@@ -101,6 +104,10 @@ export function createMapillaryProvider({ source }) {
             state.status = null;
             state.keyRequired = !source.hasToken();
           }
+          const first = !state.statusKnown;
+          state.statusKnown = true;
+          // Coverage held back until now: draw it if the layer is on.
+          if (first) parts.coverage.refresh();
           context.notify();
           return { configured: !state.keyRequired };
         },