[FEATURE] Collapsible/Expandable Headers in Editor

[piknockyou]

Please add support for collapsing and expanding content under Markdown headers (e.g., #, ##, etc.) in the editor. This would greatly enhance navigation, especially in long notes. Collapsing finalized chapters improves overview and reduces scrolling. Similar to code folding in IDEs or heading folding in Word.

Thanks for the great app!

[pbek]

It would not be easy to get that right...