[STORY] As a host, I need an UI to edit playlist information for media sources, in order to provide metadata for an episode

Parent Epic: [EPIC] Refactor playlist and metadata management (aura#155 - closed)

Provide an UI to edit unstructured playlist information per episode.

Advanced metadata handling will be solved in aura#399.

Proposal

• Provide a free text field to store unstructured playlist info (episode.media_description)