Cleaned a bit more

tools/editor/styles/components/tool-panel.css

@@ -1,6 +1,9 @@
 /* Component – Tool panel */
 
 .tool-panel {
+  background: var(--bg-surface);
+  border: 1px solid var(--border);
+  border-radius: var(--radius);
   width: 210px;
   flex-shrink: 0;
   overflow: hidden;