Remove per node snapshot in favour of single top level snapshot

Summary: In order to support focus mode we need to have only 1 snapshot. In practice this is the case but we are making this more apparant in this diff.

Reviewed By: lblasa

Differential Revision: D41493003

fbshipit-source-id: 19ed7213d15adaea4732f4ec60309efa8dae6f94

desktop/plugins/public/ui-debugger/components/main.tsx

@@ -24,7 +24,6 @@ export function Component() {
   const rootId = useValue(instance.rootId);
   const nodes: Map<Id, UINode> = useValue(instance.nodes);
   const metadata: Map<MetadataId, Metadata> = useValue(instance.metadata);
-  const snapshots: Map<Id, Snapshot> = useValue(instance.snapshots);
 
   const [showPerfStats, setShowPerfStats] = useState(false);
   const [selectedNode, setSelectedNode] = useState<Id | undefined>(undefined);
@@ -70,7 +69,6 @@ export function Component() {
         <Visualization2D
           rootId={rootId}
           nodes={nodes}
-          snapshots={snapshots}
           selectedNode={selectedNode}
           onSelectNode={setSelectedNode}
           modifierPressed={ctrlPressed}