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/js/maplibre-utils.js

@@ -223,8 +223,13 @@
    *   - GPX present, pair NOT covered by any single file → connector drawn
    *   - force_connect on arriving entry → always draw connector
    */
-  function buildJourneySegments(entries, allTrackpoints, thresholdKm) {
-    thresholdKm = thresholdKm || 10;
+  /*
+   * opts.autoconnect (bool, default true): when false, only entries with
+   * force_connect:true are connected — all other pairs are left unconnected.
+   */
+  function buildJourneySegments(entries, allTrackpoints, thresholdKm, opts) {
+    thresholdKm  = thresholdKm || 10;
+    var autoconnect = !opts || opts.autoconnect !== false;
     var hasGpx   = allTrackpoints && allTrackpoints.length > 0;
     var segments = [];
     var current  = [];
@@ -241,7 +246,11 @@
       var prev    = entries[i - 1];
       var connect;
 
-      if (!hasGpx || e.force_connect) {
+      if (e.force_connect) {
+        connect = true;
+      } else if (!autoconnect) {
+        connect = false;
+      } else if (!hasGpx) {
         connect = true;
       } else {
         var pLat    = parseFloat(prev.lat);
@@ -295,7 +304,7 @@
    * When gpxUrls is empty, Promise.all resolves immediately → no GPX layers,
    * buildJourneySegments draws a full connector line between all entries.
    */
-  function renderGpxJourney(map, gpxUrls, entries, gpxSourcePrefix, journeySourceId) {
+  function renderGpxJourney(map, gpxUrls, entries, gpxSourcePrefix, journeySourceId, opts) {
     Promise.all(gpxUrls.map(function (url, idx) {
       return fetch(url)
         .then(function (r) { return r.text(); })
@@ -314,7 +323,7 @@
         .catch(function (err) { console.warn('GPX load failed:', url, err); return []; });
     })).then(function (allTrackpoints) {
       var valid    = allTrackpoints.filter(function (tp) { return tp.length > 0; });
-      var segments = buildJourneySegments(entries, valid, 10);
+      var segments = buildJourneySegments(entries, valid, 10, opts);
       addJourneySegments(map, segments, journeySourceId);
     });
   }