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/home.html.twig

@@ -152,7 +152,7 @@
 var HOME_ENTRIES  = {{ map_entries|json_encode|raw }};
 var HOME_GPX_URLS = {{ home_gpx_urls|json_encode|raw }};
 var USE_GPX       = {{ trip and trip.header.use_gpx is not null ? (trip.header.use_gpx ? 'true' : 'false') : 'true' }};
-var AUTOCONNECT   = {{ trip and trip.header.autoconnect is not null ? (trip.header.autoconnect ? 'true' : 'false') : 'true' }};
+var AUTOCONNECT   = "{{ trip ? (trip.header.autoconnect ?? 'on') : 'on' }}";
 
 var homeMap = new maplibregl.Map({
     container: 'home-map',
@@ -194,7 +194,7 @@ homeMap.on('load', function () {
 
     setTimeout(function () { homeMap.resize(); }, 100);
 
-    MapUtils.renderGpxJourney(homeMap, USE_GPX ? HOME_GPX_URLS : [], HOME_ENTRIES, 'home-gpx', 'home-journey', { autoconnect: AUTOCONNECT });
+    MapUtils.renderGpxJourney(homeMap, USE_GPX ? HOME_GPX_URLS : [], HOME_ENTRIES, 'home-gpx', 'home-journey', { connectMode: AUTOCONNECT });
 });
 </script>
 {% endif %}