feat(map): mobile fullscreen button for feed mini-map

Button in the bottom-right corner of the map, hidden ≥769px. Clicking
it toggles .is-fullscreen on .feed-map-wrap (position:fixed, full
viewport), locks body scroll, and calls feedMap.resize() so MapLibre
re-renders at the new size. Icon swaps between expand SVG and ✕.

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

themes/intotheeast/templates/dailies.html.twig

@@ -37,7 +37,14 @@
 
 {% if map_entries|length > 0 %}
 <div class="feed-map-wrap">
-    <div class="feed-map" id="feed-map"></div>
+    <div class="feed-map" id="feed-map">
+        <button class="feed-map-fullscreen-btn" id="feed-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>
     <a class="feed-map-link" href="{{ page.parent().url }}/map">View full map →</a>
 </div>
 
@@ -86,6 +93,19 @@ feedMap.on('load', function () {
     MapUtils.addJourneySegments(feedMap, segments, 'feed-journey');
 });
 </script>
+<script>
+(function() {
+    var fsBtn = document.getElementById('feed-map-fullscreen');
+    var mapWrap = document.querySelector('.feed-map-wrap');
+    if (!fsBtn || !mapWrap) return;
+    fsBtn.addEventListener('click', function() {
+        var isFs = mapWrap.classList.toggle('is-fullscreen');
+        fsBtn.setAttribute('aria-label', isFs ? 'Close map' : 'Expand map');
+        document.body.style.overflow = isFs ? 'hidden' : '';
+        setTimeout(function() { typeof feedMap !== 'undefined' && feedMap.resize(); }, 50);
+    });
+})();
+</script>
 {% endif %}
 
 <div class="feed-sort-bar">