refactor(web): remove resize observer action (#26647)

web/src/lib/components/timeline/Timeline.svelte

@@ -1,7 +1,6 @@
 <script lang="ts">
   import { afterNavigate, beforeNavigate } from '$app/navigation';
   import { page } from '$app/state';
-  import { resizeObserver, type OnResizeCallback } from '$lib/actions/resize-observer';
   import Thumbnail from '$lib/components/assets/thumbnail/thumbnail.svelte';
   import Month from '$lib/components/timeline/Month.svelte';
   import Scrubber from '$lib/components/timeline/Scrubber.svelte';
@@ -260,8 +259,6 @@
   const updateIsScrolling = () => (timelineManager.scrolling = true);
   // note: don't throttle, debounch, or otherwise do this function async - it causes flicker
 
-  const topSectionResizeObserver: OnResizeCallback = ({ height }) => (timelineManager.topSectionHeight = height);
-
   onMount(() => {
     if (!enableRouting) {
       invisible = false;
@@ -634,7 +631,7 @@
     style:height={timelineManager.totalViewerHeight + 'px'}
   >
     <section
-      use:resizeObserver={topSectionResizeObserver}
+      bind:clientHeight={timelineManager.topSectionHeight}
       class:invisible
       style:position="absolute"
       style:left="0"