📝 Add docstrings to codex/refactor-app-ready-to-simplify-animation-frame (#290)

Docstrings generation was requested by @shayancoin.

* #146 (comment)

The following files were modified:

* `frontend/src/app/components/app-ready.tsx`

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

Author: coderabbitai[bot]

frontend/src/app/components/app-ready.tsx

@@ -2,6 +2,13 @@
 
 import { useEffect } from 'react'
 
+/**
+ * Marks the DOM element with id "app" as ready when the component mounts.
+ *
+ * Schedules a single animation frame to set `data-ready="true"` on the element with id `app`; if the element is not present no action is taken. Cancels the scheduled frame on unmount if it has not yet run.
+ *
+ * @returns `null` — renders nothing
+ */
 export function AppReadyEffect() {
   useEffect(() => {
     const appElement = document.getElementById('app')
@@ -25,4 +32,4 @@ export function AppReadyEffect() {
   }, [])
 
   return null
-}
+}