Add support for overriding column widths in grid block

packages/client/src/components/app/GridBlock.svelte

@@ -85,6 +85,7 @@
     columns?.forEach(column => {
       overrides[column.field] = {
         displayName: column.label,
+        width: column.width,
       }
     })
     return overrides

packages/frontend-core/src/components/grid/stores/columns.js

@@ -194,7 +194,7 @@ export const initialise = context => {
             name: field,
             label: fieldSchema.displayName || field,
             schema: fieldSchema,
-            width: fieldSchema.width || oldColumn?.width || DefaultColumnWidth,
+            width: oldColumn?.width || fieldSchema.width || DefaultColumnWidth,
             visible: fieldSchema.visible ?? true,
             order: fieldSchema.order ?? oldColumn?.order,
             primaryDisplay: field === primaryDisplay,