v2.26.12: fix AIS/ADS-B dashboards ignoring configured observer position

Pass DEFAULT_LATITUDE/DEFAULT_LONGITUDE from config to both standalone
dashboard templates so observer-location.js uses .env values instead of
falling back to hardcoded London coordinates on first visit.

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

routes/adsb.py

@@ -40,6 +40,8 @@ from config import (
     ADSB_DB_PORT,
     ADSB_DB_USER,
     ADSB_HISTORY_ENABLED,
+    DEFAULT_LATITUDE,
+    DEFAULT_LONGITUDE,
     SHARED_OBSERVER_LOCATION_ENABLED,
 )
 from utils import aircraft_db
@@ -1197,6 +1199,8 @@ def adsb_dashboard():
         'adsb_dashboard.html',
         shared_observer_location=SHARED_OBSERVER_LOCATION_ENABLED,
         adsb_auto_start=ADSB_AUTO_START,
+        default_latitude=DEFAULT_LATITUDE,
+        default_longitude=DEFAULT_LONGITUDE,
         embedded=embedded,
     )
 

routes/ais.py

@@ -15,7 +15,7 @@ import time
 from flask import Blueprint, Response, jsonify, render_template, request
 
 import app as app_module
-from config import SHARED_OBSERVER_LOCATION_ENABLED
+from config import DEFAULT_LATITUDE, DEFAULT_LONGITUDE, SHARED_OBSERVER_LOCATION_ENABLED
 from utils.constants import (
     AIS_RECONNECT_DELAY,
     AIS_SOCKET_TIMEOUT,
@@ -542,5 +542,7 @@ def ais_dashboard():
     return render_template(
         'ais_dashboard.html',
         shared_observer_location=SHARED_OBSERVER_LOCATION_ENABLED,
+        default_latitude=DEFAULT_LATITUDE,
+        default_longitude=DEFAULT_LONGITUDE,
         embedded=embedded,
     )