revert npm 0.15.4 for now

Author: ma2bd

frontend/package.json

@@ -34,8 +34,8 @@
     "@heroui/system": "2.4.20",
     "@heroui/tabs": "^2.2.21",
     "@heroui/theme": "2.4.20",
-    "@linera/client": "0.15.4",
-    "@linera/signer": "0.15.4",
+    "@linera/client": "0.15.3",
+    "@linera/signer": "0.15.3",
     "@react-aria/ssr": "3.9.10",
     "@react-aria/visually-hidden": "3.8.26",
     "@tailwindcss/postcss": "4.1.11",