added testing box for new cell

partials/GridEditor.vue

 <template lang="pug">
 
   div.cell-grid-container
+
+    // for testing only
+    .fixed-top-left.bg-red.z-top.q-px-md(v-if="newCell", style="height: 50px;") {{ newCell.value }}
+
     q-window-resize-observable(@resize="updateGridDimensions")
 
     div.cell-grid(
@@ -217,6 +221,7 @@
     },
     computed: {
       ...mapGetters({
+        newCell: 'mosys/getNewCell',
         user: 'auth/getUserState',
         isMobile: 'globalSettings/getIsMobile',
         // editingCells: 'mosys/getEditingCells'