Record the supported Node range in the lockfile

package.json declares engines: node >=22 <25; npm writes that into the
lockfile on the next install. Committing it keeps a fresh clone from
producing a diff on the first npm ci.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

package-lock.json

@@ -36,6 +36,9 @@
         "tailwindcss": "^4.3.3",
         "typescript": "^5.9.3",
         "vitest": "^4.1.10"
+      },
+      "engines": {
+        "node": ">=22 <25"
       }
     },
     "node_modules/@adobe/css-tools": {