feat(design): glass surfaces by role, the static Badge, LinkButton, user pickers on the Combobox (E28 S3d1)

frontend/src/components/ConfigPanel.tsx

@@ -20,6 +20,7 @@ import { notifyActionError } from "../lib/actionErrors";
 import { Button } from "./ui/Button";
 import { CheckRow } from "./ui/NativeControls";
 import { Input } from "./ui/Input";
+import { SURFACE } from "./ui/surfaces";
 
 // Admin Configuration page: edit DB-overridable operational settings (registry-driven from the
 // backend — adding a key there makes it appear here automatically). Edits are drafted and
@@ -195,7 +196,7 @@ export default function ConfigPanel() {
       </PageToolbar>
       <div className="px-4 pb-24 pt-3 max-w-3xl w-full mx-auto">
         {activeGroup && (
-          <div className="glass rounded-2xl p-4 mb-4">
+          <div className={`${SURFACE.panel} p-4 mb-4`}>
             <div className="divide-y divide-border/60">
               {(data.groups[activeGroup] ?? []).map((item) => (
                 <Field