You don’t need to do this. Above the text box, there’s “preview” button.

Can’t see which is the demo / frontend repo. Can you make the left panel’s width adjustable, or change it to a full page menu? It’s difficult to see and use the bbox map.

Diary doesn’t work for proper high visibility discussion. I’m not using Telegram either, as it’s tied to phone number, not allowing organizing different identities with OSM. I have created a post detailing the problems here. https://community.openstreetmap.org/t/complaint-and-criticism-against-osmpie-for-redefining-and-promoting-poorly-thought-tags-without-discussing-and-annoucing-clearly/136885

Are you using a drawing tablet with display?

You can’t delete or edit most “user-side” text content. This is already the best.