refactor(street-level): one provider, no orbit overview, no prewarm, simpler tile choice

The layer now owns its Mapillary parts directly: the provider registry,
pick router, multi-provider UI summary, params codec helper and provider
context are gone. createStreetLevelLayer({ source }) builds coverage,
sequences, the nearest-image lookup and the MapillaryJS viewer itself; a
single providerOn switch keeps the share link's `mapillary` option (off
draws nothing), and getParams/setParams keep { mapillary, pano, sinceDays }.

No z0-5 overview points: above 60 km nothing is drawn and the panel says to
zoom in; the proxy now serves only coverage z11-14. Tiles come from the
visible ground within range of the camera, ranked from the ground under it
(no line-of-sight ranking or near-range padding). MapillaryJS loads on the
first photo; viewer prewarm is removed. Key status, a rejected key and a
rate limit share one `blocked` state on coverage.

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

src/app/layers/streetLevel.js

@@ -1,14 +1,13 @@
 import { createStreetLevelLayer } from '../../layers/streetLevel/index.js';
-import { createMapillaryProvider } from '../../layers/streetLevel/providers/mapillary/index.js';
 import * as sprites from '../../data/spriteOrder.js';
 import * as picking from '../../data/pickRegistry.js';
 import * as input from '../../data/inputOwnership.js';
 import * as render from '../../renderGovernor.js';
 
-/** A new provider registers here; its chip, credit and share bit follow. */
+/** The Street Level layer over the application's Mapillary source. */
 export function createApplicationStreetLevel({ sources }) {
   return createStreetLevelLayer({
-    providers: [createMapillaryProvider({ source: sources.mapillary })],
+    source: sources.mapillary,
     services: { sprites, picking, input, render },
   });
 }