refactor(feedback): seed the image read queue ref directly

src/renderer/src/components/sidebar/use-sidebar-feedback-images.ts

@@ -37,8 +37,7 @@ export function useSidebarFeedbackImages(params: {
   const pendingImageReadsRef = useRef({ count: 0, bytes: 0 })
   // Why: a shrunk image's size is unknown until it is read, so batches read one
   // at a time, each sized against what the batches before it actually committed.
-  const readQueueRef = useRef<Promise<void>>(undefined!)
-  readQueueRef.current ??= Promise.resolve()
+  const readQueueRef = useRef<Promise<void>>(Promise.resolve())
 
   const clearImages = useCallback(() => {
     liveImageDraftsRef.current.forEach(releaseFeedbackImageDraft)