getFavoriteByPeerId
Retrieves a favorite by the associated peer ID.
This method searches the list of favorites for an entry that is linked to the provided peerId, which could represent either a contact or a room. If a matching favorite is found, the corresponding IRainbowFavorite object is returned. If no favorite is associated with the given peer ID, the function returns null.
Return
The IRainbowFavorite object corresponding to the given peer ID, or null if not found.
Parameters
peerId
The unique ID of the contact or room associated with the favorite.