perf: lazy-load ShaderGradient and fix image cache TTL

Co-authored-by: denshooter <44590296+denshooter@users.noreply.github.com>

app/layout.tsx

@@ -2,10 +2,15 @@ import "./globals.css";
 import { Metadata } from "next";
 import { Inter, Playfair_Display } from "next/font/google";
 import React from "react";
+import dynamic from "next/dynamic";
 import ClientProviders from "./components/ClientProviders";
 import { cookies } from "next/headers";
 import { getBaseUrl } from "@/lib/seo";
-import ShaderGradientBackground from "./components/ShaderGradientBackground";
+
+const ShaderGradientBackground = dynamic(
+  () => import("./components/ShaderGradientBackground"),
+  { ssr: false, loading: () => null }
+);
 
 const inter = Inter({
   variable: "--font-inter",