feat(layers): highlight aircraft broadcasting a transponder emergency

Flights and Military Flights tint aircraft red while the latest poll
carries squawk 7500/7600/7700 or an adsb.lol ADS-B emergency status
(general/unlawful/nordo/downed). Minimum-fuel and lifeguard priorities
are reported but not tinted. The Cockpit HUD aircraft-meta line names
the broadcast code in red. The status is not sticky: a cleared code
stops highlighting on the next refresh.

The analyst/voice query engine gains squawk, emergency and
emergencyKind fields. No new source or request: OpenSky state vectors
already carry the squawk and adsb.lol/readsb carries both fields.

Built by the Hex project (Crew Leo Agile dev team).

Co-Authored-By: Claude <[email protected]>

src/data/militaryFlights.test.mjs

@@ -71,11 +71,31 @@ test('military analyst record: full record maps every contract field', () => {
     aircraftClass: 'widebody',
     originCountry: null,
     operator: 'United States Air Force',
+    squawk: null,
+    emergency: false,
+    emergencyKind: null,
     routeOrigin: null,
     routeDestination: null,
   });
 });
 
+test('military analyst record: emergency flag is only raised for emergency severity', () => {
+  const hijack = mapAnalystRecord('ae01ce', {
+    ...FULL_INFO,
+    squawk: '7500',
+    emergency: { kind: 'unlawful', severity: 'emergency', squawk: '7500' },
+  });
+  assert.equal(hijack.squawk, '7500');
+  assert.equal(hijack.emergency, true);
+  assert.equal(hijack.emergencyKind, 'unlawful');
+  const lifeguard = mapAnalystRecord('ae01ce', {
+    ...FULL_INFO,
+    emergency: { kind: 'lifeguard', severity: 'priority', squawk: null },
+  });
+  assert.equal(lifeguard.emergency, false);
+  assert.equal(lifeguard.emergencyKind, 'lifeguard');
+});
+
 test('military analyst record: military is ALWAYS true, routes/country always null', () => {
   const r = mapAnalystRecord('ae01ce', undefined);
   assert.equal(r.military, true);