Fix validation error position for new rows

packages/frontend-core/src/components/grid/cells/GridCell.svelte

@@ -165,7 +165,6 @@
   .cell[data-row="0"] .label {
     bottom: auto;
     top: 100%;
-    border-radius: 0 2px 2px 2px;
     padding: 2px 4px 2px 4px;
     margin: -2px 0 0 0;
   }

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

@@ -167,7 +167,7 @@
           focused={$focusedCellId === cellId}
           width={$stickyColumn.width}
           {updateValue}
-          rowIdx={0}
+          rowIdx={offset === 0 ? 0 : 1}
           {invertY}
         >
           {#if $stickyColumn?.schema?.autocolumn}