Update button column to account for ability to add rows

packages/frontend-core/src/components/grid/layout/ButtonColumn.svelte

@@ -20,6 +20,7 @@
     showVScrollbar,
     showHScrollbar,
     dispatch,
+    config,
   } = getContext("grid")
 
   let container
@@ -103,9 +104,12 @@
           </GridCell>
         </div>
       {/each}
+      {#if $config.canAddRows}
         <div
           class="row blank"
-        on:mouseenter={$isDragging ? null : () => ($hoveredRowId = BlankRowID)}
+          on:mouseenter={$isDragging
+            ? null
+            : () => ($hoveredRowId = BlankRowID)}
           on:mouseleave={$isDragging ? null : () => ($hoveredRowId = null)}
         >
           <GridCell
@@ -114,6 +118,7 @@
             on:click={() => dispatch("add-row-inline")}
           />
         </div>
+      {/if}
     </GridScrollWrapper>
   </div>
 </div>