fix: bump @mintel/payload-ai to 1.9.13 and apply CSS loader shim for Next.js dev server

apps/web/ignore-css.mjs

@@ -0,0 +1,12 @@
+import { extname } from 'node:path';
+
+export async function load(url, context, nextLoad) {
+    if (url.endsWith('.css') || url.endsWith('.scss')) {
+        return {
+            format: 'module',
+            shortCircuit: true,
+            source: 'export default {};'
+        };
+    }
+    return nextLoad(url, context);
+}