[UI] Provide more details about the number of videos found/filtered

The YouTube API will return all Liked videos that are public or unlisted. It will not return private videos. However, the total number of videos within the playlist, `pageInfo.totalResults` will be the summation of public, unlisted, and private videos as far as I am aware. Maybe let the user know that some of the videos in the playlist is private, hence the _inaccurate_ number.

For example, in my case there is 520 videos in my Liked playlist, but only 490 are currently showing.

Start by tracing the UI that displays the playlist's total and the number of videos returned by the YouTube API. Check how pageInfo.totalResults is presented versus the fetched public and unlisted videos; done means the interface explains that private videos can make the displayed counts differ.

Written by the indexing model from the issue text.