feat: add OfflineBanner component to LayoutContent for offline notifications and update styles in OfflineBanner

app/layout-content.tsx

@@ -1,5 +1,6 @@
 'use client'
 
+import { OfflineBanner } from '@/components/OfflineBanner'
 import { Header, Footer } from '@ciphera-net/ui'
 import { useAuth } from '@/lib/auth/context'
 import Link from 'next/link'
@@ -53,6 +54,7 @@ export default function LayoutContent({ children }: { children: React.ReactNode
         showSecurity={false}
         showPricing={true}
       />
+      <OfflineBanner />
       <main className="flex-1 pt-24 pb-8">
         {children}
       </main>