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/layers/localAdsb.js

@@ -0,0 +1,48 @@
+import { createLocalAdsbLayer } from '../../layers/localAdsb/index.js';
+import { createLocalReceiverFeeds } from '../../layers/localAdsb/feeds.js';
+import { SdrController } from '../../sdr/controller.js';
+import * as render from '../../renderGovernor.js';
+import * as context from '../../data/contextStore.js';
+import * as picking from '../../data/pickRegistry.js';
+import * as trails from '../../data/trailRenderer.js';
+import * as geoid from '../../data/geoid.js';
+import { markDetectionSourcesChanged } from '../../data/detection.js';
+import { refreshTrackedReadout } from '../../data/trackedReadout.js';
+
+/**
+ * Construct the Local ADS-B layer, the browser RTL-SDR session it shares with
+ * the Radio panel, and the decoder-feed session. Construction opens no device
+ * and makes no request; the SDR starts only from an explicit Connect and the
+ * feeds are polled only while the layer is enabled.
+ *
+ * `displayParams` reads the public Flights layer's DISPLAY-rail 3D preference
+ * (`{ models3d, models3dMode }`) so local aircraft follow the same toggle;
+ * `enrichment` is the Flights source whose cached adsbdb proxy they share.
+ */
+export function createApplicationLocalAdsb({
+  receiver = new SdrController(),
+  feeds = createLocalReceiverFeeds(),
+  surface = null,
+  enrichment = null,
+  displayParams = null,
+  resolveAsset = (url) =>
+    `${import.meta.env?.BASE_URL || '/'}${url.replace(/^\//, '')}`,
+} = {}) {
+  return createLocalAdsbLayer({
+    receiver,
+    feeds,
+    resolveAsset,
+    services: {
+      render,
+      context,
+      picking,
+      trails,
+      geoid,
+      groundSnap: surface?.groundSnap || null,
+      enrichment,
+      display: displayParams ? { getParams: displayParams } : null,
+      detection: { markSourcesChanged: markDetectionSourcesChanged },
+      overlays: { refreshReadout: refreshTrackedReadout },
+    },
+  });
+}