feat(sdr): local receivers — browser RTL-SDR, Local ADS-B layer and decoder feeds (#732)

Adds a Local ADS-B layer fed by your own receivers: a browser WebUSB
RTL-SDR (with FM listening) and local 1090/978 MHz decoder feeds
(LOCAL_RECEIVER_FEEDS, local and private addresses only). Local aircraft
draw in magenta with class, silhouettes, 3D models, trails and a position
sanity filter; the click card names the band and input that heard them.

Builds on Sameh Khamis's SDR prototype and the initial GEV port by
Mazeyar Moeini Feizabadi (#134); the decoder-feed design follows the
notes on #57. Closes #57.

Co-authored-by: Sameh Khamis <[email protected]>
Co-authored-by: Mazeyar Moeini Feizabadi <[email protected]>

src/data/aircraftClass.js

@@ -438,6 +438,20 @@ export function classifyAircraft({ typeCode, category } = {}) {
   return 'airliner';
 }
 
+/** Readable name of each class, for cards and readouts. */
+export const AIRCRAFT_CLASS_LABELS = Object.freeze({
+  light: 'Light aircraft',
+  glider: 'Glider',
+  turboprop: 'Turboprop',
+  airliner: 'Airliner',
+  widebody: 'Widebody',
+  quadjet: 'Four-engine jet',
+  helicopter: 'Helicopter',
+  fastjet: 'Fast jet',
+  bizjet: 'Business jet',
+  uav: 'Drone',
+});
+
 /** Billboard scale multipliers (skylight GLYPH_SCALE, + fastjet). */
 export const CLASS_SCALE_2D = {
   light: 0.62,