chore: update config for Next.js 16 compatibility

- Remove deprecated eslint config from next.config.ts
- Fix serverActions.allowedOrigins to handle undefined env var
- Update tsconfig.json with Next.js 16 recommended settings (jsx: react-jsx)
- Format proxy.ts

Author: remote-swe-app[bot]

webapp/next.config.ts

@@ -1,16 +1,18 @@
 import type { NextConfig } from 'next';
 
+const allowedOrigins = ['localhost:3000'];
+if (process.env.ALLOWED_ORIGIN_HOST) {
+  allowedOrigins.push(process.env.ALLOWED_ORIGIN_HOST);
+}
+
 const nextConfig: NextConfig = {
   output: 'standalone',
-  eslint: {
-    ignoreDuringBuilds: true,
-  },
   experimental: {
     webpackBuildWorker: true,
     parallelServerBuildTraces: true,
     parallelServerCompiles: true,
     serverActions: {
-      allowedOrigins: ['localhost:3000', process.env.ALLOWED_ORIGIN_HOST!],
+      allowedOrigins,
     },
   },
   typescript: {

webapp/src/proxy.ts

@@ -36,5 +36,5 @@ export const config = {
      * - favicon.ico (favicon file)
      */
     '/((?!api|_next/static|_next/image|favicon.ico|sign-in).*)',
-  ]
+  ],
 };

webapp/tsconfig.json

@@ -1,7 +1,11 @@
 {
   "compilerOptions": {
     "target": "ES2017",
-    "lib": ["dom", "dom.iterable", "esnext"],
+    "lib": [
+      "dom",
+      "dom.iterable",
+      "esnext"
+    ],
     "allowJs": true,
     "skipLibCheck": true,
     "strict": true,
@@ -11,17 +15,27 @@
     "moduleResolution": "bundler",
     "resolveJsonModule": true,
     "isolatedModules": true,
-    "jsx": "preserve",
+    "jsx": "react-jsx",
     "incremental": true,
     "plugins": [
       {
         "name": "next"
       }
     ],
     "paths": {
-      "@/*": ["./src/*"]
+      "@/*": [
+        "./src/*"
+      ]
     }
   },
-  "include": ["next-env.d.ts", "**/*.ts", "**/*.tsx", ".next/types/**/*.ts"],
-  "exclude": ["node_modules"]
+  "include": [
+    "next-env.d.ts",
+    "**/*.ts",
+    "**/*.tsx",
+    ".next/types/**/*.ts",
+    ".next/dev/types/**/*.ts"
+  ],
+  "exclude": [
+    "node_modules"
+  ]
 }