Adding Search actions and a Shell action to organize desktop

[kisyaki]

What does this PR do?

Search in [Spotify, Discogs, Goodreads, Urban Dictionary] and move all files in desktop to new folder with today's date.

Checklist

• Folder name is kebab-case (e.g. professional-email)
• extension.yaml has all required fields (name, description, author, version, tags, icon, type)
• YAML starts with # cai-extension on the first line
• Icon is a valid SF Symbol name
• Tested in Cai before submitting
• No API keys or secrets in the YAML (use setup fields instead)
• If shell or applescript type: command is safe and well-documented