[FR] A few feature requests

[zenminimalist]

Thanks so much for proving the folder preview! You rock! 🤘

• Ability to save the window's size and position automatically with next Quick look, esp. the right side panel (big one for me) where when you expand the right side panel to view more of the preview it saves that size and position
• Add a PDF category and/or the ability to preview PDF files
• Option to collapse/expand all folders at once
• Markdown preview with TOC would be awesome.