fix: Meshtastic traceroute button and dark mode maps

- Fix traceroute button in Meshtastic popups using event delegation
  instead of inline onclick handlers (more reliable with Leaflet)
- Update all maps to use dark CARTO tiles for consistency:
  - ADS-B dashboard radar map
  - AIS dashboard vessel map
  - Satellite dashboard ground map
  - APRS map
  - Satellite ground track map in main UI
- Change settings manager default tile provider to cartodb_dark

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

static/js/core/settings-manager.js

@@ -8,7 +8,7 @@ const Settings = {
         'offline.enabled': false,
         'offline.assets_source': 'cdn',
         'offline.fonts_source': 'cdn',
-        'offline.tile_provider': 'openstreetmap',
+        'offline.tile_provider': 'cartodb_dark',
         'offline.tile_server_url': ''
     },