refactor: extract shared entry-map partial (Phase 2)

trip.html.twig and home.html.twig hand-wrote near-identical map-column
markup + a MapUtils.initEntryMap() invocation. Extract both into
partials/entry-map.html.twig, parameterised (map id, global, entries,
gpx config, story markers). Callers now pass resolved header values.

The map engine (js/map.js initEntryMap) is unchanged; emitted config is
byte-equivalent to the previous inline scripts. Verified: trip-map,
home-map and window.tripMap/homeMap Playwright tests pass; both pages 200.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

themes/intotheeast/templates/trip.html.twig

@@ -56,16 +56,18 @@
 {% endfor %}
 
 <div class="home-layout">
-    <div class="home-map-col">
-        <div class="home-map" id="trip-map">
-            <button class="feed-map-fullscreen-btn" id="trip-map-fullscreen" aria-label="Expand map">
-                <svg class="feed-map-fs-open" aria-hidden="true" width="14" height="14" viewBox="0 0 14 14" fill="currentColor">
-                    <path d="M0 0v4h1.5V1.5H4V0z M14 0H10v1.5h2.5V4H14z M0 14v-4h1.5v2.5H4V14z M14 14H10v-1.5h2.5V10H14z"/>
-                </svg>
-                <span class="feed-map-fs-close" aria-hidden="true">✕</span>
-            </button>
-        </div>
-    </div>
+    {% include 'partials/entry-map.html.twig' with {
+        map_id: 'trip-map',
+        map_global: 'tripMap',
+        entries: map_entries,
+        card_prefix: 'entry-',
+        story_markers: true,
+        gpx_urls: gpx_urls,
+        use_gpx: page.header.use_gpx ?? true,
+        autoconnect: page.header.autoconnect ?? 'on',
+        gpx_source_prefix: 'gpx',
+        journey_id: 'trip-journey'
+    } only %}
 
     {% include 'partials/trip-feed-col.html.twig' with {
         trip_page: page,
@@ -80,25 +82,6 @@
     } only %}
 </div>
 
-<script>
-var TRIP_ENTRIES = {{ map_entries|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 ?? 'on' }}";
-
-document.addEventListener('DOMContentLoaded', function() {
-    window.tripMap = MapUtils.initEntryMap({
-        container:    'trip-map',
-        entries:      TRIP_ENTRIES,
-        cardPrefix:   'entry-',
-        storyMarkers: true,
-        fullscreen:   { btnId: 'trip-map-fullscreen', colSelector: '.home-map-col' },
-        gpx:          { urls: GPX_URLS, use: USE_GPX, autoconnect: AUTOCONNECT, sourcePrefix: 'gpx', journeyId: 'trip-journey' },
-        fit:          { padding: 60, maxZoom: 11, singleZoom: 10 }
-    });
-}); // DOMContentLoaded
-</script>
-
 <button class="story-totop" id="trip-totop" aria-label="Back to top">↑ Top</button>
 
 {% endblock %}