feat: migrate from Create React App to Next.js (#281)

Replace the deprecated CRA framework with Next.js 15 (App Router) to
unblock TypeScript 5 and other dependency upgrades.

Co-authored-by: Claude <noreply@anthropic.com>

Author: rickstaa

.gitignore

@@ -8,11 +8,16 @@
 # testing
 /coverage
 
+# next.js
+/.next/
+/out/
+
 # production
 /build
 
 # misc
 .DS_Store
+*.pem
 .env.local
 .env.development.local
 .env.test.local
@@ -25,5 +30,10 @@ yarn-error.log*
 # IDEA
 .vscode
 *.code-workspace
-
-.vercel
+
+# vercel
+.vercel
+
+# typescript
+*.tsbuildinfo
+next-env.d.ts

eslint.config.mjs

@@ -0,0 +1,21 @@
+import { dirname } from "path";
+import { fileURLToPath } from "url";
+import { FlatCompat } from "@eslint/eslintrc";
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = dirname(__filename);
+
+const compat = new FlatCompat({
+  baseDirectory: __dirname,
+});
+
+const eslintConfig = [
+  ...compat.extends("next/core-web-vitals"),
+  {
+    rules: {
+      "@next/next/no-img-element": "off",
+    },
+  },
+];
+
+export default eslintConfig;

next.config.ts

@@ -0,0 +1,10 @@
+import type { NextConfig } from "next";
+
+const nextConfig: NextConfig = {
+  output: "export",
+  images: {
+    unoptimized: true,
+  },
+};
+
+export default nextConfig;