fix(gnss): address review - reference source wiring, honest method, 429 backoff, QA render proof

- Route the adsb.lol GNSS source through createReferenceSources and the
  constructCatalog contract; app layer module is a thin pass-through.
- Describe the method honestly: gpsjam.org's published cell formula and
  bands; per-aircraft thresholds are the 14 CFR 91.227(c) ADS-B Out minima
  (NIC < 7, NACp < 8) plus readsb gpsOkBefore.
- Proxy: reuse the adsb.lol anchor parser, honour upstream Retry-After
  (clamped 5-120 s), serve stale during cooldown, cap the body size.
- Layer: redraw only when a cell id or band changes, treat a settling
  camera as a retry rather than a rejected enable, keep low cells visible,
  skip rows without finite coordinates, state the 3-aircraft rule in the
  legend blurb.
- Voice: gnss-interference in set_layer_visibility / show_data_layers_menu
  plus common aliases; voice pins re-derived.
- qa-gnss: stub the route in-page (request interception stalls Cesium's
  geometry workers), assert every cell is built, cover all bands over land
  and sea, screenshot every state with the Data Layers row open.

Hex project - Crew Leo Agile dev team.

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

CHANGELOG.md

@@ -156,9 +156,10 @@
   under NLOD 2.0.
 
 - GNSS Interference layer (Events group): ADS-B aircraft that report degraded
-  navigation accuracy (NIC < 7 or NACp < 8, or readsb's GPS-loss flag) are
-  binned into 0.5° cells over a rolling 30-minute window and coloured with the
-  gpsjam.org bands. Keyless, worldwide wherever adsb.lol has receivers; reads
+  navigation accuracy (below the 14 CFR 91.227 ADS-B Out minima, NIC < 7 or
+  NACp < 8, or readsb's GPS-loss flag) are binned into 0.5° cells over a
+  rolling 30-minute window and scored with gpsjam.org's published formula and
+  bands. Keyless, worldwide wherever adsb.lol has receivers; reads
   a capped 250 nm snapshot around the camera through `/api/gnss-integrity`,
   which returns integrity fields only and serves the last snapshot when the
   upstream fails.