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

app/admin/layout.tsx

@@ -149,7 +149,7 @@ export default function AdminLayout({
 
   return (
     // ✅ prevent browser-level horizontal scroll from any wide children
-    <div className="flex min-h-screen bg-black text-zinc-50 overflow-x-hidden">
+    <div className="min-h-screen bg-black text-zinc-50 overflow-x-hidden pt-[52px]">
       <AdminLeftNavigation
         collapsed={collapsed}
         onToggleCollapsed={() => setCollapsed((v) => !v)}
@@ -157,8 +157,11 @@ export default function AdminLayout({
       />
 
       {/* ✅ min-w-0 is the critical fix: lets the main column shrink */}
-      <div className="flex min-h-screen flex-1 min-w-0 flex-col">
-        <header className="flex items-center justify-between border-b border-zinc-900 bg-zinc-950/70 px-4 py-3">
+      <div
+        className="flex min-h-screen flex-1 min-w-0 flex-col transition-all duration-300"
+        style={{ marginLeft: collapsed ? '68px' : '280px' }}
+      >
+        <header className="flex items-center justify-between border-b border-zinc-900 bg-zinc-950/70 px-4 py-3 sticky top-0 z-30 backdrop-blur-sm">
           <div>
             <p className="text-xs uppercase tracking-[0.18em] text-zinc-500">
               Admin