feat(street-level): one imagery source at a time; IC8 review fixes

- One provider is lit at a time: lighting a chip darkens the others, and a
  chip click records every registered provider's switch in one update so
  the share link keeps the swap (also off Google 3D, where Street View is
  not listed). The layer starts with the first default-on provider
  (Mapillary, free); params that light several keep the one already on,
  so reapplying them never flips (litByParams). The now-unreachable
  "several lit" chip paths are gone.
- Leaving Google 3D during a Street View lookup ends it without an error
  or a stuck loading state (openImage's early return resets it; the
  lookup loop rechecks availability).
- A source swap during a lookup no longer reports "no imagery".
- Street View lit off Google 3D says the panel needs the Google 3D map.
- Comments trimmed to the why; keySetupCore.test.mjs back to upstream's
  formatting plus the one new test (was a 551-line reformat).

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

src/layers/streetLevel/policy.js

@@ -37,12 +37,8 @@ export const FOLLOW_MAP_STACK_ID = 'photoreal';
 /** Eye height above the sampled ground when the globe camera follows the viewer. */
 export const FOLLOW_EYE_HEIGHT_M = 2.4;
 
-/**
- * A ground click opens the nearest image of a provider without coverage lines
- * (Google Street View) only from this close: from higher up it is a misclick.
- */
+/** Above this, a ground click is a misclick, not a street. */
 export const GROUND_CLICK_MAX_HEIGHT_M = 3_000;
 
-/** OPEN STREET VIEW aimed at the sky: it opens what the user aims at, or nothing. */
 export const AIM_AT_GROUND_MESSAGE =
   'Aim the middle of the view at a street to look for imagery there';