feat(adsb): add IATA↔ICAO airline code translation for ACARS cross-linking

ACARS messages use IATA codes (e.g. UA2412) while ADS-B uses ICAO
callsigns (e.g. UAL2412). Add a translation layer so the two can
match, enabling click-to-highlight and datalink message correlation.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

utils/flight_correlator.py

@@ -5,6 +5,8 @@ from __future__ import annotations
 import time
 from collections import deque
 
+from utils.airline_codes import expand_search_terms, translate_flight
+
 
 class FlightCorrelator:
     """Correlate ACARS and VDL2 messages with ADS-B aircraft."""
@@ -26,7 +28,10 @@ class FlightCorrelator:
         })
 
     def get_messages_for_aircraft(
-        self, icao: str | None = None, callsign: str | None = None
+        self,
+        icao: str | None = None,
+        callsign: str | None = None,
+        registration: str | None = None,
     ) -> dict[str, list[dict]]:
         """Match ACARS/VDL2 messages by callsign, flight, or registration fields."""
         if not icao and not callsign:
@@ -37,6 +42,11 @@ class FlightCorrelator:
             search_terms.add(callsign.strip().upper())
         if icao:
             search_terms.add(icao.strip().upper())
+        if registration:
+            search_terms.add(registration.strip().upper())
+
+        # Expand with IATA↔ICAO airline code translations
+        search_terms = expand_search_terms(search_terms)
 
         acars = []
         for msg in self._acars_messages:
@@ -55,8 +65,15 @@ class FlightCorrelator:
         """Check if any identifying field in msg matches the search terms."""
         for field in ('flight', 'tail', 'reg', 'callsign', 'icao', 'addr'):
             val = msg.get(field)
-            if val and str(val).strip().upper() in terms:
+            if not val:
+                continue
+            upper_val = str(val).strip().upper()
+            if upper_val in terms:
                 return True
+            # Also try translating the message field value
+            for translated in translate_flight(upper_val):
+                if translated in terms:
+                    return True
         return False
 
     @staticmethod