fix(video): pass onDownload callback to LoadFailedVideo component

Make onRedownload prop required in LoadFailedVideo and directly pass the onDownload callback instead of using optional chaining. This ensures the redownload functionality works consistently when video loading fails.

src/renderer/src/pages/video/VideoViewer.tsx

@@ -50,7 +50,9 @@ export const VideoViewer = ({ video, onDownload, onRegenerate }: VideoViewerProp
           </video>
         )}
         {video && video.status === 'failed' && <FailedVideo error={video.error} />}
-        {video && video.status === 'downloaded' && loadSuccess === false && <LoadFailedVideo />}
+        {video && video.status === 'downloaded' && loadSuccess === false && (
+          <LoadFailedVideo onRedownload={onDownload} />
+        )}
       </div>
     </>
   )
@@ -161,7 +163,7 @@ const FailedVideo = ({ error }: { error: VideoFailed['error'] }) => {
   )
 }
 
-const LoadFailedVideo = ({ onRedownload }: { onRedownload?: () => void }) => {
+const LoadFailedVideo = ({ onRedownload }: { onRedownload: () => void }) => {
   const { t } = useTranslation()
   return (
     <div className="flex h-full w-full flex-col items-center justify-center rounded-2xl bg-danger-200">
@@ -169,9 +171,7 @@ const LoadFailedVideo = ({ onRedownload }: { onRedownload?: () => void }) => {
       <span className="font-bold text-2xl">{t('video.error.load.message')}</span>
       <span>{t('video.error.load.reason')}</span>
       <div className="my-2 flex justify-between gap-2">
-        <Button onPress={() => onRedownload?.() || window.toast.info('Not implemented')}>
-          {t('common.redownload')}
-        </Button>
+        <Button onPress={onRedownload}>{t('common.redownload')}</Button>
       </div>
     </div>
   )