web: restrict Next.js dev watcher to prevent EMFILE exhaustion

apps/web/next.config.ts

@@ -1,5 +1,6 @@
 import type { NextConfig } from "next";
 import path from "node:path";
+import { homedir } from "node:os";
 
 const nextConfig: NextConfig = {
   // Produce a self-contained standalone build so npm global installs
@@ -17,6 +18,23 @@ const nextConfig: NextConfig = {
 
   // Transpile ESM-only packages so webpack can bundle them
   transpilePackages: ["react-markdown", "remark-gfm"],
+
+  webpack: (config, { dev }) => {
+    if (dev) {
+      config.watchOptions = {
+        ...config.watchOptions,
+        ignored: [
+          "**/node_modules/**",
+          "**/.git/**",
+          "**/dist/**",
+          "**/.next/**",
+          path.join(homedir(), ".openclaw", "**"),
+        ],
+        poll: 1500,
+      };
+    }
+    return config;
+  },
 };
 
 export default nextConfig;