List of favorite users.
In the isShowingFavorites mode, you can add user names with "@" (for example, @username).
In keyword mode, regular words or phrases are added.
The placeholder in the input field varies depending on the mode.
Exclusion of hiding posts of selected users:
The isFavoriteUser check has been added to the hidePosts function. If the author of the post is in favoriteUsers, his post is not hidden, even if it contains keywords.
