feat(build): Add undo/redo functionality and integrate custom nodes

Introduce a `useUndoRedo` hook to manage state history with undo/redo, persistence using localStorage, and state validation. Updated the build page to display a flow with initial custom nodes and edges, replacing the previous flow editor implementation.

autogpt_platform/frontend/package.json

@@ -63,6 +63,7 @@
     "framer-motion": "^12.0.11",
     "geist": "^1.3.1",
     "launchdarkly-react-client-sdk": "^3.6.1",
+    "lodash": "^4.17.21",
     "lucide-react": "^0.474.0",
     "moment": "^2.30.1",
     "next": "^14.2.21",
@@ -94,6 +95,7 @@
     "@storybook/react": "^8.3.5",
     "@storybook/test": "^8.3.5",
     "@storybook/test-runner": "^0.21.0",
+    "@types/lodash": "^4.17.15",
     "@types/negotiator": "^0.6.3",
     "@types/node": "^22.13.0",
     "@types/react": "^18",