fix(SW-441): fixes after PR

hooks/useScrollSpy.ts

@@ -46,12 +46,9 @@ export default function useScrollSpy(
     const observer = new IntersectionObserver(handleIntersection, mergedOptions)
     const elements = sectionIds
       .map((id) => document.getElementById(id))
-      .filter(Boolean)
+      .filter((el): el is HTMLElement => !!el)
 
     elements.forEach((element) => {
-      if (!element) {
-        return
-      }
       observer.observe(element)
     })