Fix global timezone on ADS-B dashboard and harden VDL2 correlation

Timezone fixes:
- Add utils.js (InterceptTime) to adsb_dashboard.html — was completely
  missing, causing all times to fall back to UTC regardless of setting
- Register onChange listener in nav.html so clock updates instantly
  when timezone/format is changed in Settings
- Initialize timezone/format dropdowns on ADS-B dashboard page load
- Browser-verified: ET/12h ↔ UTC/24h switches instantly on ADS-B page

VDL2 correlation fix:
- Force ICAO hex to uppercase when promoting from VDL2 src.addr (dumpvdl2
  may output lowercase, ADS-B stores uppercase — case mismatch prevented
  correlator from matching)
- Move ICAO/addr promotion before ACARS field extraction so even
  non-ACARS VDL2 frames (XID, connection mgmt) get correlated

Auth:
- Add INTERCEPT_DISABLE_AUTH env var to skip login for local/dev use
- Configurable via docker-compose.yml environment

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

templates/adsb_dashboard.html

@@ -22,6 +22,7 @@
         window.INTERCEPT_DEFAULT_LAT = {{ default_latitude | tojson }};
         window.INTERCEPT_DEFAULT_LON = {{ default_longitude | tojson }};
     </script>
+    <script src="{{ url_for('static', filename='js/core/utils.js') }}"></script>
     <script defer src="{{ url_for('static', filename='vendor/leaflet/leaflet.js') }}"></script>
     <script defer src="{{ url_for('static', filename='js/core/observer-location.js') }}"></script>
 </head>
@@ -5730,6 +5731,16 @@ sudo make install</code>
 
     <!-- Settings Modal -->
     {% include 'partials/settings-modal.html' %}
+    <script>
+    // Initialize timezone/format dropdowns from saved preferences
+    (function() {
+        if (typeof InterceptTime === 'undefined') return;
+        var tzSel = document.getElementById('globalTimezoneSelect');
+        var fmtSel = document.getElementById('globalTimeFormatSelect');
+        if (tzSel) tzSel.value = InterceptTime.getTimezone();
+        if (fmtSel) fmtSel.value = InterceptTime.getHour12() ? '12' : '24';
+    })();
+    </script>
 
     <!-- Help Modal -->
     {% include 'partials/help-modal.html' %}

templates/partials/nav.html

@@ -551,6 +551,10 @@
             }
             setInterval(updateNavUtcClock, 1000);
             updateNavUtcClock();
+            // React immediately when timezone/format changes in Settings
+            if (typeof InterceptTime !== 'undefined' && InterceptTime.onChange) {
+                InterceptTime.onChange(updateNavUtcClock);
+            }
         }
     })();
 </script>