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/app/constructCatalog.test.mjs

@@ -39,7 +39,13 @@ test('catalogs construct distinct layers and classification from their supplied
     signal: b.signal,
     surface: fixtureSurface(b.signal),
   });
-  assert.equal(first.layers.length, 27);
+  assert.equal(first.layers.length, 28);
+  assert.ok(first.get('local-adsb'), 'Local ADS-B is registered');
+  assert.deepEqual(
+    first.metadata.find(({ id }) => id === 'local-adsb'),
+    { id: 'local-adsb', disposition: 'local-only' },
+    'the hardware-local layer is never serialized into links',
+  );
   assert.notEqual(first.weatherClock, second.weatherClock);
   await first.weatherClock.setTarget('2026-09-21T12:00:00.000Z');
   assert.match(