feat: add per-trip use_gpx and autoconnect toggles

Adds two configurable toggles to the trip blueprint (Admin2 Trip tab):
- use_gpx: show/hide GPX tracks on all maps (default: enabled)
- autoconnect: draw connector lines between markers (default: enabled)

When use_gpx is off, GPX files are not fetched or rendered on any map
(home, map, trip, dailies). The stats panel in trip.html.twig still
reads GPX_URLS directly and is unaffected.

When autoconnect is off, buildJourneySegments suppresses all
auto-connectors; only entries with force_connect:true still draw a
line — making force_connect behaviour independent of both settings.

Also refactors the inline Promise.all in trip.html.twig to use the
shared renderGpxJourney utility (reducing duplication).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Vgmzx8VTTTmCskSpQtsLTr

themes/intotheeast/templates/map.html.twig

@@ -42,8 +42,10 @@
 <script src="{{ url('theme://js/maplibre-utils.js') }}"></script>
 
 <script>
-var ENTRIES  = {{ map_entries|json_encode|raw }};
-var GPX_URLS = {{ gpx_urls|json_encode|raw }};
+var ENTRIES     = {{ map_entries|json_encode|raw }};
+var GPX_URLS    = {{ gpx_urls|json_encode|raw }};
+var USE_GPX     = {{ trip_page.header.use_gpx ?? true ? 'true' : 'false' }};
+var AUTOCONNECT = {{ trip_page.header.autoconnect ?? true ? 'true' : 'false' }};
 
 var map = new maplibregl.Map({
     container: 'trip-map',
@@ -92,7 +94,7 @@ map.on('load', function () {
     }
 
     /* ── GPX tracks + journey segments ─────────────────────────── */
-    MapUtils.renderGpxJourney(map, GPX_URLS, ENTRIES, 'gpx', 'journey');
+    MapUtils.renderGpxJourney(map, USE_GPX ? GPX_URLS : [], ENTRIES, 'gpx', 'journey', { autoconnect: AUTOCONNECT });
 });
 </script>
 {% endblock %}