update position page design

src/layouts/AdminLayout.jsx

@@ -179,7 +179,11 @@ export default function AdminLayout() {
 
   return (
     <AssistantPanelProvider role="admin" pathname={location.pathname}>
-      <div className="min-h-screen bg-surface-subtle">
+      {/* Transparent so the ambient canvas painted behind the app reads through.
+          An opaque shell here would cover it and every Admin page would lose the
+          tint at once — which is exactly why the canvas is one layer and not a
+          background repeated on each page. */}
+      <div className="min-h-screen">
         {/* Single bar header in the new Admin design system */}
         <header className="sticky top-0 z-40 border-b border-border bg-white/85 backdrop-blur-xl">
           <div className="flex h-14 items-center justify-between gap-4 px-4 lg:px-6">