feat: expand connect markers to 4-mode select

Replaces the boolean toggle with a select field offering:
  on             — connect all consecutive entries (chronological line)
  manual         — force_connect entries only (user-controlled connections)
  intelligent_gpx — suppress connectors where GPX covers both endpoints;
                    force_connect overrides (original smart logic, restored)
  off            — no connectors at all; force_connect also ignored

buildJourneySegments gains an optional trackpointsPerFile param used
only by intelligent_gpx mode. renderGpxJourney extracts trackpoints
only when connectMode is intelligent_gpx. dailies.html.twig falls
back from intelligent_gpx → on (mini-map has no GPX tracks to
suppress against).

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

themes/intotheeast/templates/dailies.html.twig

@@ -44,7 +44,8 @@
 <script src="{{ url('theme://js/maplibre-utils.js') }}"></script>
 <script>
 var FEED_ENTRIES = {{ map_entries|json_encode|raw }};
-var AUTOCONNECT  = {{ trip_page.header.autoconnect ?? true ? 'true' : 'false' }};
+{% set _ac = trip_page.header.autoconnect ?? 'on' %}
+var AUTOCONNECT  = "{{ _ac == 'intelligent_gpx' ? 'on' : _ac }}";
 
 var feedMap = new maplibregl.Map({
     container: 'feed-map',
@@ -79,7 +80,7 @@ feedMap.on('load', function () {
         feedMap.fitBounds(bounds, { padding: 60, maxZoom: 11 });
     }
 
-    var segments = MapUtils.buildJourneySegments(FEED_ENTRIES, { autoconnect: AUTOCONNECT });
+    var segments = MapUtils.buildJourneySegments(FEED_ENTRIES, { connectMode: AUTOCONNECT });
     MapUtils.addJourneySegments(feedMap, segments, 'feed-journey');
 });
 </script>