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]>

THIRD_PARTY_NOTICES.md

@@ -0,0 +1,21 @@
+# Third-party software notices
+
+The project depends on third-party npm packages whose own licenses apply. This
+file records the packages added for the browser-local SDR feature; the complete
+resolved dependency inventory remains in `package-lock.json`.
+
+## Web RTL-SDR
+
+- Package: `@jtarrio/webrtlsdr` 3.0.6
+- Author: Jacobo Tarrio Barreiro; portions copyright Google Inc.
+- Source: <https://github.com/jtarrio/webrtlsdr>
+- License: Apache License 2.0
+- License text: <https://www.apache.org/licenses/LICENSE-2.0>
+
+## Signals
+
+- Package: `@jtarrio/signals` 0.10.1
+- Author: Jacobo Tarrio Barreiro
+- Source: <https://github.com/jtarrio/signals>
+- License: Apache License 2.0
+- License text: <https://www.apache.org/licenses/LICENSE-2.0>