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/trip.html.twig

@@ -298,7 +298,9 @@
 <script src="{{ url('theme://js/maplibre-utils.js') }}"></script>
 <script>
 var TRIP_ENTRIES = {{ map_entries|json_encode|raw }};
-var GPX_URLS = {{ gpx_urls|json_encode|raw }};
+var GPX_URLS     = {{ gpx_urls|json_encode|raw }};
+var USE_GPX      = {{ page.header.use_gpx ?? true ? 'true' : 'false' }};
+var AUTOCONNECT  = {{ page.header.autoconnect ?? true ? 'true' : 'false' }};
 
 var tripMap = new maplibregl.Map({
     container: 'trip-map',
@@ -349,30 +351,7 @@ tripMap.on('load', function () {
     }
 
     /* ── GPX tracks + journey segments ─────────────────────────── */
-    Promise.all(GPX_URLS.map(function (url, idx) {
-        return fetch(url)
-            .then(function (r) { return r.text(); })
-            .then(function (text) {
-                var xml     = new DOMParser().parseFromString(text, 'text/xml');
-                var geojson = toGeoJSON.gpx(xml);
-                var sid     = 'gpx-' + idx;
-                tripMap.addSource(sid, { type: 'geojson', data: geojson });
-                tripMap.addLayer({
-                    id: sid + '-line', type: 'line', source: sid,
-                    layout: { 'line-join': 'round', 'line-cap': 'round' },
-                    paint:  { 'line-color': MapUtils.ACCENT, 'line-width': 2, 'line-opacity': 0.7 }
-                });
-                return MapUtils.extractTrackpoints(geojson);
-            })
-            .catch(function (err) {
-                console.warn('GPX load failed:', url, err);
-                return [];
-            });
-    })).then(function (allTrackpoints) {
-        var validTrackpoints = allTrackpoints.filter(function (tp) { return tp.length > 0; });
-        var segments = MapUtils.buildJourneySegments(TRIP_ENTRIES, validTrackpoints, 10);
-        MapUtils.addJourneySegments(tripMap, segments, 'trip-journey');
-    });
+    MapUtils.renderGpxJourney(tripMap, USE_GPX ? GPX_URLS : [], TRIP_ENTRIES, 'gpx', 'trip-journey', { autoconnect: AUTOCONNECT });
 });
 setTimeout(function () { tripMap.resize(); }, 100);