Add auth system, fix map defaults, controls overflow, fix latest-date ref

web/templates/map.html

@@ -34,6 +34,8 @@
             border-radius: 8px;
             box-shadow: 0 2px 10px rgba(0,0,0,0.2);
             min-width: 200px;
+            max-height: calc(100vh - 20px);
+            overflow-y: auto;
         }
 
         .controls h3 {
@@ -291,7 +293,7 @@
                 <span>Diff Layer</span>
             </div>
             <div class="layer-item" draggable="true" data-layer="osm">
-                <input type="checkbox" id="osmToggle" checked>
+                <input type="checkbox" id="osmToggle">
                 <span>OSM Layer (Gray)</span>
             </div>
             <div class="layer-item" draggable="true" data-layer="county">
@@ -306,7 +308,7 @@
             Show Added (Green)
         </label>
         <label>
-            <input type="checkbox" id="showRemoved" checked>
+            <input type="checkbox" id="showRemoved">
             Show Removed (Red)
         </label>
         <label>