fix: make output export build-only so dev route handlers work

biome.json

@@ -7,7 +7,7 @@
   },
   "files": {
     "ignoreUnknown": false,
-    "includes": ["src/**/*", "app/**/*"]
+    "includes": ["src/**/*", "app/**/*", "*.ts", "*.tsx", "*.js", "*.jsx"]
   },
   "formatter": {
     "enabled": true,

next.config.ts

@@ -1,8 +1,12 @@
-import type { NextConfig } from 'next'
+import type { NextConfig } from 'next';
+
+const isExport = process.env.NODE_ENV === 'production';
 
 const nextConfig: NextConfig = {
-  output: 'export',
+  /* output: 'export' only applies at build time — enabling it in dev mode
+   * breaks route handlers (incompatible with force-dynamic in Next.js 16) */
+  ...(isExport ? { output: 'export' } : {}),
   images: { unoptimized: true },
-}
+};
 
-export default nextConfig
+export default nextConfig;