Fix playlist creation regression and improve UI / UX

Description

In the Save Playlist dialog:

• Improves the Playlist items UI by adding a thumbnail and more info
• Fix possible text cut off by showing the number of media on a new line
• Fix the playlist creation regression
• Improve the Add action UX by forcing the playlist name to not exist

Motivation and Context

How Has This Been Tested?

Screenshots / GIFs (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Enhancement (non-breaking change which cleans up / improves existing functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the CONTRIBUTING section of the README document.

Resolves

Fixes: #1224 (closed) #1223 (closed) Mention: #