Add maps fullscreen and enforce single-line search controls

app/public/index.html

@@ -158,6 +158,12 @@
 
   <!-- ── TAB: MAPS ── -->
   <div id="tab-maps" class="tab-panel hidden">
+    <div class="section-head">
+      <span class="section-label">Maps</span>
+      <span class="section-actions">
+        <button id="maps-fullscreen-btn" class="link-btn" type="button">Fullscreen map</button>
+      </span>
+    </div>
     <div class="maps-wrap">
       <div id="map-overview" class="radar-map map-overview"></div>
       <div class="maps-controls">