upgrade rspack

Author: williamstein

src/packages/next/lib/with-customize.ts

@@ -67,7 +67,7 @@ export default async function withCustomize(
   customize.onCoCalcCom = customize.kucalc === KUCALC_COCALC_COM;
   customize.noindex = obj.props?.unlisted ?? false;
   customize.imprintOrPolicies =
-    (customize.imprint ?? "" + customize.policies ?? "") != "";
+    (customize.imprint ?? "") + (customize.policies ?? "") != "";
   customize.serverTime = Date.now();
 
   // this is used for creating new projects from a share

src/packages/next/package.json

@@ -102,7 +102,7 @@
     "@types/node": "^18.16.14",
     "@types/react": "^19.1.10",
     "@uiw/react-textarea-code-editor": "^3.1.1",
-    "next-rspack": "^15.3.4",
+    "next-rspack": "^15.4.6",
     "node-mocks-http": "^1.14.1"
   }
 }