feat: Introduce a new mail package for email templates and update the gatekeeper login page with new logo assets.

packages/gatekeeper/src/app/gatekeeper/login/page.tsx

@@ -55,12 +55,13 @@ export default async function LoginPage({ searchParams }: LoginPageProps) {
         {/* Logo / Icon */}
         <div className="flex justify-center mb-12">
           <div
-            className="w-20 h-20 rounded-3xl flex items-center justify-center border border-white/10 bg-white/5 backdrop-blur-xl shadow-2xl"
+            className="w-48 h-24 rounded-3xl flex items-center justify-center border border-white/10 bg-white/5 backdrop-blur-xl shadow-2xl p-6"
             style={{ borderBottom: `2px solid ${projectColor}44` }}
           >
-            <ShieldCheck
-              className="w-10 h-10"
-              style={{ color: projectColor }}
+            <img
+              src="/logo-white.svg"
+              alt={projectName}
+              className="w-full h-auto opacity-90"
             />
           </div>
         </div>