fix(street-level): IC8 follow-ups for Google Street View

- An open after a failed one is no longer failed by the old panorama's
  status: only status_changed can reject; position_changed only resolves.
- A nearest lookup aborted, timed out or refused while Google's script
  loads no longer sends its getPanorama request once the script arrives.
- A panorama-details lookup that never answers times out after 10 s,
  cools down and retries; an unmount releases lookups in flight, and
  their late answers are dropped.
- Every Maps loader on a page shares one script load and ready callback,
  and either can retry a failed script.
- OPEN STREET VIEW aimed at the sky opens nothing and says to aim at a
  street, instead of looking up the camera footprint.

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

src/layers/streetLevel/providers/google/policy.js

@@ -31,6 +31,8 @@ export const KEY_REJECTED_MESSAGE =
 export const NEAREST_TIMEOUT_MS = 10_000;
 /** A panorama that has not shown by then has failed to open. */
 export const OPEN_TIMEOUT_MS = 20_000;
+/** A panorama-details lookup that takes longer has failed (and can retry). */
+export const DETAILS_TIMEOUT_MS = 10_000;
 /** Minimum pause after a failed panorama-details lookup before a view can retry. */
 export const DETAILS_RETRY_COOLDOWN_MS = 5_000;