Refactor admin layout and merchants page for improved UI and functionality; add URL copy feature and enhance date formatting

components/Banner.tsx

@@ -2,9 +2,9 @@ import React from "react";
 
 export function Banner() {
   return (
-    <div>
+    <div className="fixed top-0 left-0 right-0 z-50">
       {/* Early access bar */}
-      <div className="border-b border-amber-500/20 bg-amber-500/5">
+      <div className="border-b border-amber-500/20 bg-amber-500/5 backdrop-blur-sm">
         <div className="mx-auto flex max-w-6xl flex-col gap-1 px-4 py-2 text-[0.75rem] text-amber-100 md:flex-row md:items-center md:justify-between">
           <div className="flex items-center gap-2">
             <span className="rounded-sm bg-amber-500/20 px-2 py-0.5 text-[0.65rem] font-semibold uppercase tracking-[0.18em] text-amber-300">