perf: task-fix-raf-derived-to-effect changes

src/routes/spaces/[relay]/[h]/+page.svelte

@@ -348,11 +348,15 @@
 
     elements.reverse()
 
-    requestAnimationFrame(manageScrollPosition)
-
     return elements
   })
 
+  $effect(() => {
+    if (elements.length > 0) {
+      requestAnimationFrame(manageScrollPosition)
+    }
+  })
+
   const start = () => {
     cleanup?.()
 

src/routes/spaces/[relay]/chat/+page.svelte

@@ -240,11 +240,15 @@
 
     elements.reverse()
 
-    requestAnimationFrame(manageScrollPosition)
-
     return elements
   })
 
+  $effect(() => {
+    if (elements.length > 0) {
+      requestAnimationFrame(manageScrollPosition)
+    }
+  })
+
   const start = () => {
     cleanup?.()