ENG-1478: refresh config tree before emitter-driven rebuild

toggleFoldedState mutates folded.uid in-place then dual-writes to
block props, triggering pull watch → emitter → buildConfig(). Without
refreshConfigTree(), buildConfig() reads stale UIDs from the cached
tree, overwriting the in-place mutation and orphaning Roam blocks.

Author: sid597

apps/roam/src/components/LeftSidebarView.tsx

@@ -340,6 +340,7 @@ export const useConfig = () => {
   const [config, setConfig] = useState(() => buildConfig());
   useEffect(() => {
     const handleUpdate = () => {
+      refreshConfigTree();
       setConfig(buildConfig());
     };
     const unsubGlobal = onSettingChange("global:Left sidebar", handleUpdate);