more editor stuff

editor/client/public/map/index.html

@@ -52,7 +52,10 @@
       <span id="zLevelLabel">0</span>
     </div>
     <div class="d-flex gap-3">
-      <div id="tilePalette" class="tile-palette"></div>
+      <div class="d-flex flex-column gap-2">
+        <button type="button" id="fillToggle" class="btn btn-sm btn-outline-secondary">Fill: Off</button>
+        <div id="tilePalette" class="tile-palette"></div>
+      </div>
       <canvas id="gridCanvas" class="border tile-grid" width="512" height="512"></canvas>
     </div>