SLA: cap by retention in API; SLA UI uses effective days and shows retention notice; rebuild client

client/package.json

@@ -13,6 +13,7 @@
     "react-router-dom": "^7.10.0",
     "react-scripts": "5.0.1",
     "recharts": "^3.5.1",
+    "skywatch": "file:..",
     "web-vitals": "^2.1.4"
   },
   "scripts": {