feat: complete MVP foundation auth and dashboard

app/login/page.tsx

@@ -1,19 +1,14 @@
-import { LockKeyhole } from "lucide-react";
+import { redirect } from "next/navigation";
 
-export default function LoginPage() {
-  return (
-    <main className="flex min-h-dvh items-center justify-center bg-background px-6 py-12">
-      <section className="w-full max-w-md rounded-lg border bg-card p-6 text-card-foreground">
-        <LockKeyhole className="mb-5 size-6 text-muted-foreground" />
-        <h1 className="text-2xl font-semibold tracking-normal">
-          Login-Platzhalter
-        </h1>
-        <p className="mt-3 text-sm leading-6 text-muted-foreground">
-          Better Auth wird in einem spaeteren Task angebunden. Bis dahin bleibt
-          diese Route als definierter Einstiegspunkt fuer den Admin-Login
-          bestehen.
-        </p>
-      </section>
-    </main>
-  );
+import { AuthEntry } from "@/components/auth-entry";
+import { getCurrentMockSession } from "@/lib/mock-session";
+
+export default async function LoginPage() {
+  const session = await getCurrentMockSession();
+
+  if (session) {
+    redirect("/dashboard");
+  }
+
+  return <AuthEntry />;
 }