migrate: switch from bun to pnpm and add zod dependency

package.json

@@ -57,6 +57,7 @@
     "postgres": "^3.4.7",
     "svelte-dnd-action": "^0.9.67",
     "tailwind-merge": "^3.4.0",
-    "tailwind-variants": "^3.2.2"
+    "tailwind-variants": "^3.2.2",
+    "zod": "^3.23.8"
   }
 }