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/map.html.twig

@@ -45,7 +45,7 @@
 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 AUTOCONNECT = "{{ trip_page.header.autoconnect ?? 'on' }}";
 
 var map = new maplibregl.Map({
     container: 'trip-map',
@@ -94,7 +94,7 @@ map.on('load', function () {
     }
 
     /* ── GPX tracks + journey segments ─────────────────────────── */
-    MapUtils.renderGpxJourney(map, USE_GPX ? GPX_URLS : [], ENTRIES, 'gpx', 'journey', { autoconnect: AUTOCONNECT });
+    MapUtils.renderGpxJourney(map, USE_GPX ? GPX_URLS : [], ENTRIES, 'gpx', 'journey', { connectMode: AUTOCONNECT });
 });
 </script>
 {% endblock %}