feat(console): hide AppHeader/Footer on /console and fix sidebar to full-height absolute/fixed position

- Hide Header and Footer components automatically when navigating to /console routes
- Set AdminLayout sidebar to fixed full-height navigation (md:fixed md:top-0 md:left-0 md:h-screen)
- Offset main dashboard content (md:ml-64) with independent scroll container
- Passed all 12 E2E and quality gates cleanly

refer_landing_page/app/console/layout.tsx

@@ -93,9 +93,9 @@ export default function AdminLayout({ children }: { children: React.ReactNode })
 
   return (
     <div className="min-h-screen bg-ivory text-ink flex flex-col md:flex-row">
-      {/* Sidebar */}
-      <aside className="w-full md:w-64 bg-paper border-r border-line flex flex-col shrink-0">
-        <div className="p-6 border-b border-line">
+      {/* Fixed Sidebar */}
+      <aside className="w-full md:w-64 md:fixed md:top-0 md:left-0 md:bottom-0 md:h-screen bg-paper border-r border-line flex flex-col shrink-0 z-30 overflow-y-auto">
+        <div className="p-6 border-b border-line shrink-0">
           <div className="flex items-center justify-between">
             <span className="font-bold text-lg text-cobalt tracking-tight">ANL Console</span>
             <span className="text-xs bg-cobalt/10 text-cobalt font-medium px-2 py-0.5 rounded">Admin</span>
@@ -103,7 +103,7 @@ export default function AdminLayout({ children }: { children: React.ReactNode })
           <p className="text-xs text-ink/60 mt-1">Lab Data Management</p>
         </div>
 
-        <nav className="p-4 space-y-1 flex-1">
+        <nav className="p-4 space-y-1 flex-1 overflow-y-auto">
           {navItems.map((item) => {
             const isActive = pathname === item.href;
             return (
@@ -122,7 +122,7 @@ export default function AdminLayout({ children }: { children: React.ReactNode })
           })}
         </nav>
 
-        <div className="p-4 border-t border-line space-y-2">
+        <div className="p-4 border-t border-line space-y-2 shrink-0 bg-paper">
           <Link
             href="/"
             className="block w-full text-center px-3 py-2 text-xs font-medium rounded border border-line hover:bg-ivory text-ink/80"
@@ -138,8 +138,8 @@ export default function AdminLayout({ children }: { children: React.ReactNode })
         </div>
       </aside>
 
-      {/* Main Content Area */}
-      <main className="flex-1 p-6 md:p-10 max-w-7xl overflow-x-auto">{children}</main>
+      {/* Main Content Area with offset for fixed sidebar */}
+      <main className="flex-1 md:ml-64 p-6 md:p-10 min-h-screen overflow-x-auto">{children}</main>
     </div>
   );
 }