Fix VDL2 messages not appearing in aircraft datalink panel

Root cause: dumpvdl2 outputs nested JSON (vdl2.avlc.acars.flight) but
FlightCorrelator only checks top-level fields. VDL2 messages were stored
in the correlator but never matched to any aircraft.

Fix: Promote identifying fields (flight, reg, tail, icao, addr, label,
text) from the nested VDL2 structure to top-level before storing in the
correlator. Also promote AVLC source address as ICAO when src.type is
"Aircraft".

Also fix VDL2 sidebar timestamps to use global InterceptTime setting.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

templates/adsb_dashboard.html

@@ -4930,7 +4930,9 @@ sudo make install</code>
             const acars = avlc.acars || {};
             const flight = acars.flight || '';
             const msgText = acars.msg_text || '';
-            const time = new Date().toLocaleTimeString();
+            const time = typeof InterceptTime !== 'undefined'
+                ? InterceptTime.shortTime(new Date()) + InterceptTime.tzSuffix()
+                : new Date().toLocaleTimeString();
             const freq = inner.freq ? (inner.freq / 1000000).toFixed(3) : '';
 
             // Store for CSV export