feat(chapter2): set up styled app shell

Add the App Router page and nested layout, configure Tailwind and shadcn styling, include local fonts and background assets, and install the supporting UI and lint dependencies.

chapter2/src/app/(pages)/page.module.css

@@ -0,0 +1,9 @@
+/* src/app/(pages)/page.module.css */
+@reference "#tailwind.css";
+
+.block {
+    @apply tw:page-container tw:flex tw:flex-col tw:flex-none! tw:w-full tw:space-y-4 tw:p-5 tw:items-center tw:justify-center 
+       tw:rounded-sm tw:backdrop-blur-sm tw:shadow-nysm tw:shadow-neutral-800 tw:duration-300
+       tw:text-lg  tw:text-center  tw:text-white tw:bg-black/30 
+       tw:hover:shadow-nylg tw:font-lxgw;
+}