fix(street-level): IC8 review of the Street View provider

Google's Maps Platform terms forbid Street View imagery beside non-Google
maps, so the provider declares requiresMapStack: 'photoreal': off Google
3D its chip is dashed with the reason, lookups and opens skip it, and
leaving Google 3D closes its panorama.

- Ground clicks: only a click on the map itself (scenePick.isSurfacePick:
  nothing picked or Google 3D tile content) at street zoom opens Street
  View, and the camera stays put; higher up the hint says to zoom in.
  scenePick.pickGroundPosition replaces the copy in Directions.
- Viewer: poses go out at once and again when the date and address
  arrive, so an open never hangs on that lookup; one lookup per panorama,
  seeded by the nearest lookup; a close settles a pending open; failed
  lookups are asked again; poses follow position changes, not pano_changed.
- Loader: the gm_authFailure handler is installed once, so a retried load
  reports a refusal once.
- Viewer host: a prewarm that lands after another provider took the host
  is released; FIT/FILL availability is set on every open.
- Provider: a refusal while switched off reports no error over another
  photo; SINCE compares against the end of Google's month; messages name
  the referrer and network causes; FLAT says Street View is 360° only.
- The layer row names the key of the providers that are on; the MCP panel
  CSP admits Street View's tiles, control images and photos.
- Tests for each, against fakes that now follow Google's event order; the
  browser gate restores its state, waits instead of sleeping, aims its
  panel clicks and corner drags, and asserts the camera stays put.

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

DATA_SOURCES.md

@@ -21,7 +21,7 @@ How to read this:
 | **NOAA nowCOAST lightning density** (`nowcoast.noaa.gov/geoserver/observations/lightning_detection/ows`) | Lightning density: 15-minute accumulated strike density on an approximately 8 km grid, Americas and Pacific. Keyless; layer metadata refreshed every 10 minutes, exact-time images cached for up to 24 hours | NOAA Level-5 derived product from Vaisala NLDN/GLD360; the [product description](https://ocean.weather.gov/lightning/lightning_pdd.php) permits public distribution of this density product, not of raw Vaisala detections | "NOAA/NWS nowCOAST; derived from Vaisala NLDN/GLD360" |
 | **NOAA NHC / CPHC advisories** (`www.nhc.noaa.gov/CurrentStorms.json` + the `mapservices.weather.noaa.gov` tropical weather summary MapServer) | Cyclone advisories: storm positions, forecast tracks, points and cones for the Atlantic and eastern/central North Pacific. Keyless through `/api/cyclones`; cached for 5 minutes | [NWS public-data terms](https://www.weather.gov/disclaimer); no endorsement implied | "NOAA/NWS NHC / CPHC" |
 | **Mapillary** (vector tiles, Graph API, MapillaryJS) | Street Level: coverage lines, image cones and the embedded viewer. Coverage tiles cached for 24 h | Imagery [CC BY-SA 4.0](https://www.mapillary.com/terms); API under the Mapillary terms with a client token | "© Mapillary contributors, CC BY-SA 4.0", shown on the globe while the provider is on |
-| **Google Street View** (Maps JavaScript API) | Street Level: Google's panorama viewer and nearest-panorama lookups; nothing cached | Google Maps Platform ToS (your own key + billing; every panorama load is billed) | "Street View imagery © Google" on the globe while the provider is on, and Google's logo and terms in the viewer |
+| **Google Street View** (Maps JavaScript API) | Street Level, on the Google 3D map only (Google's terms): Google's panorama viewer and nearest-panorama lookups; panorama dates and addresses kept for the session only | Google Maps Platform ToS (your own key + billing; every panorama load is billed) | "Street View imagery © Google" on the globe while the provider is on, and Google's logo and terms in the viewer |
 | **OpenStreetMap** | Map and place data (roads, military areas and names, ALPR, place search, outlines); via vector tiles, hourly ALPR extract, bundled data, Nominatim and optional self-configured Overpass | [ODbL 1.0](https://opendatacommons.org/licenses/odbl/1-0/) | © OpenStreetMap contributors |
 | **Google Map Tiles API** (Photorealistic 3D Tiles) + Places/Geocoding | The 3D globe, voice scene context, and on-demand nearby installation search                                                         | Google Maps Platform ToS (proprietary, your own key + billing)                                                                                                                                                                                                                                                                                        | "Google" / "Google Maps" logo — **shown in-app**, required                                                                                  |
 | **OpenSky Network**                                                   | Primary worldwide live-flight snapshot                                                                                              | Non-commercial research/education license                                                                                                                                                                                                                                                                                                             | Schäfer et al., _"Bringing Up OpenSky"_, IPSN 2014 + opensky-network.org                                                                    |