chore: Upgrade to Next.js 16 and React 19.2

.npmrc

@@ -0,0 +1,18 @@
+# Temporary workaround for Next.js 16 + NextAuth v4 peer dependency conflict
+#
+# Next.js 16 was released on Oct 21, 2025 (very recent)
+# NextAuth v4.24.11 peer deps only allow Next.js ^12.2.5 || ^13 || ^14 || ^15
+# Auth.js v5 beta only allows Next.js ^14 || ^15
+#
+# NextAuth v4 is functionally compatible with Next.js 16 (verified by successful builds)
+# but npm blocks installation due to conservative peer dependency ranges.
+#
+# This flag tells npm to ignore peer dependency mismatches and install anyway.
+#
+# Exit strategy: Remove this file when NextAuth/Auth.js adds official Next.js 16 support
+# Expected: NextAuth v4.25+ or Auth.js v5 stable release
+#
+# Risk: Unsupported configuration, but proven to work in our codebase
+# Monitor: https://github.com/nextauthjs/next-auth/releases
+
+legacy-peer-deps=true

eslint.config.mjs

@@ -1,16 +1,9 @@
-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,
-});
+import nextCoreWebVitals from "eslint-config-next/core-web-vitals";
+import nextTypescript from "eslint-config-next/typescript";
 
 const eslintConfig = [
-  ...compat.extends("next/core-web-vitals", "next/typescript"),
+  ...nextCoreWebVitals,
+  ...nextTypescript,
   {
     ignores: [
       "node_modules/**",
@@ -20,6 +13,12 @@ const eslintConfig = [
       "next-env.d.ts",
     ],
   },
+  {
+    files: ["scripts/**/*.{js,cjs}"],
+    rules: {
+      "@typescript-eslint/no-require-imports": "off",
+    },
+  },
 ];
 
 export default eslintConfig;