fix: always clear edge store when loading new graph

Moved setEdges([]) outside the graph?.links guard to prevent stale edges
from persisting when loading a graph with no links.

autogpt_platform/frontend/src/app/(platform)/build/components/FlowEditor/Flow/useFlow.ts

@@ -137,13 +137,15 @@ export const useFlow = () => {
   // Links depend on nodes existing, so we must add nodes first
   useEffect(() => {
     if (customNodes.length > 0) {
+      // Clear both stores to prevent stale data from previous graphs
       useNodeStore.getState().setNodes([]);
       useNodeStore.getState().clearResolutionState();
+      useEdgeStore.getState().setEdges([]);
+
       addNodes(customNodes);
 
       // Only add links after nodes are in the store
       if (graph?.links) {
-        useEdgeStore.getState().setEdges([]);
         addLinks(graph.links);
       }
     }