[UI] Fixes for column resizing (#12755) (#12758)

- Apply CSS fix
- Allow proper dragging
- Ensure table columns fill 100% width

(cherry picked from commit ed84d06dbe)

Co-authored-by: Oliver <oliver.henry.walters@gmail.com>

src/frontend/src/styles/overrides.css

@@ -28,3 +28,10 @@
 .mantine-datatable-resizable-columns {
   table-layout: auto !important;
 }
+
+/*
+ * Force mantine table to 100% so columns stretch to fill.
+ */
+.mantine-datatable-resize-locked {
+  width: 100% !important;
+}