refactor: remove index.html, update package-lock.json, and enhance graph loading logic

- Deleted the `index.html` file from the project.
- Removed unnecessary "peer" properties from various dependencies in `package-lock.json`.
- Enhanced the graph loading logic in `App.tsx` to handle different graph statuses and fetch initial entities.
- Updated `GraphView.tsx` to display appropriate messages based on the graph status.
- Modified `useGraph.ts` to include a new `GraphStatus` type and manage graph loading states more effectively.

Author: aksOps

.claude/settings.json

@@ -168,7 +168,7 @@ func (h *handlers) graphNeighborhood(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 	if entity == nil {
-		writeJSON(w, 200, map[string]any{"nodes": []any{}, "edges": []any{}})
+		writeJSON(w, 404, map[string]any{"error": "entity not found", "nodes": []any{}, "edges": []any{}})
 		return
 	}