refactor(radiosonde): use MapUtils.init + Settings tile layer on sonde map

Replace hardcoded L.map() + CartoCD dark tile layer with MapUtils.init()
and add tactical overlays. Adds test verifying the cartocdn URL is gone.

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

templates/partials/modes/radiosonde.html

@@ -278,6 +278,7 @@
 
     // Map management
     let radiosondeMap = null;
+    let radiosondeMapOverlays = null;
     let radiosondeMarkers = new Map();
     let radiosondeTracks = new Map();
     let radiosondeTrackPoints = new Map();
@@ -295,16 +296,23 @@
         }
         const hasLocation = radiosondeStationLocation.lat !== 0 || radiosondeStationLocation.lon !== 0;
 
-        radiosondeMap = L.map('radiosondeMapContainer', {
+        const observerLocation = hasLocation
-            center: hasLocation ? [radiosondeStationLocation.lat, radiosondeStationLocation.lon] : [40, -95],
+            ? { lat: radiosondeStationLocation.lat, lon: radiosondeStationLocation.lon }
-            zoom: hasLocation ? 7 : 4,
+            : { lat: 40, lon: -95 };
-            zoomControl: true,
-        });
 
-        L.tileLayer('https://{s}.basemaps.cartocdn.com/dark_all/{z}/{x}/{y}{r}.png', {
+        radiosondeMap = MapUtils.init('radiosondeMapContainer', {
-            attribution: '© OpenStreetMap © CARTO',
+            center: [observerLocation.lat, observerLocation.lon],
+            zoom: hasLocation ? 7 : 4,
+            minZoom: 2,
             maxZoom: 18,
-        }).addTo(radiosondeMap);
+        });
+        if (radiosondeMap) {
+            window.radiosondeMap = radiosondeMap;
+            radiosondeMapOverlays = MapUtils.addTacticalOverlays(radiosondeMap, {
+                hudPanels: { modeName: 'RADIOSONDE', getContactCount: () => 0 },
+                scaleBar: true,
+            });
+        }
 
         // Add station marker if we have a location
         if (hasLocation) {

tests/test_map_utils.py

@@ -62,3 +62,16 @@ def test_index_includes_map_utils(client):
     html = resp.data.decode()
     assert "map-utils.js" in html
     assert "MapUtils.init" in html
+
+
+def test_radiosonde_mode_uses_map_utils(client):
+    """Main SPA index (which includes radiosonde partial) uses MapUtils for radiosonde map."""
+    with client.session_transaction() as sess:
+        sess["logged_in"] = True
+    resp = client.get("/")
+    assert resp.status_code == 200
+    html = resp.data.decode()
+    # Radiosonde map init in partial should call MapUtils.init, not bare L.tileLayer
+    assert "radiosondeMap" in html
+    # The bare cartocdn URL that was previously hardcoded should be gone
+    assert "basemaps.cartocdn.com/dark_all" not in html or html.count("basemaps.cartocdn.com/dark_all") == 0