Wire ADS-B end to end: telemetry ingestion + live map overlay

node-26#9. Adds POST /telemetry/adsb (node-key authed via
require_node_service_or_firebase_token) that upserts one Firestore doc per
icao into a new `aircraft` collection, org_id stamped from the reporting
node the same way upload.py defensively stamps `calls`. firestore.rules
gets a matching docInMyOrg()-gated read rule.

Frontend: useAircraft() mirrors useNodes()'s onSnapshot pattern, filtering
docs older than 2 minutes client-side since nothing prunes a stale aircraft
doc server-side yet. MapView gets an opt-in "Aircraft" overlay (unchecked
by default, like the weather radar layer) rendering a rotated plane glyph
per sighting.

Unverified via typecheck — no Node.js/npm on this authoring box yet (see
CLAUDE.md Testing reality). Server side is pytest-covered (test_telemetry.py).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

drb-frontend/lib/types.ts

@@ -53,12 +53,27 @@ export interface NodeRecord {
   hardware_preset?: string;
   ppm_override?: number | null;
   node_type?: string;
+  secondary_sdr_mode?: string;
+  sdr_count?: number;
   enforce_override_timeout?: boolean;
   is_overridden?: boolean;
   override_system_id?: string | null;
   override_timeout_at?: string | null;
 }
 
+export interface AircraftTrack {
+  icao: string;
+  org_id?: string;
+  node_id: string;
+  callsign: string | null;
+  lat: number | null;
+  lon: number | null;
+  altitude_ft: number | null;
+  ground_speed_kt: number | null;
+  track_deg: number | null;
+  last_seen: string;
+}
+
 export interface VocabularyPendingTerm {
   term: string;
   source: "induction" | "correction";