Clear diagram, or plain text editor

[Zorakie]

So I am used to work on the go, = from a phone. I am using Opera with desktop site setting.

Problem: Mermaid automatically loads previous diagram from local storage, and there seems to be no option to disable that.
There is no button to Clear diagram and start from scratch.

Why it is important? The code editor is not a native element, so whenever you try to focus cursor somewhere, the zoom freaks out. Selecting all by long tap also does not work... abd the zoom freaks out.

So the workflow looks like this:
You let e.g. AI to generate the diagram.
You open Mermaid.
You fight with the editor for like 10 minutes trying to delete everything to paste your new diagram.
You give up.

There is no console command to select all and delete as well.
Mobile view (to fight the zoom) is broken as mermaid seems not to be optimized for mobiles at all

The request is as follows:
Either:

1. start always with a clear canvas, do not automatically load previous session data
   or
   2)Add a Clear all button
   or
2. Allow us to switch to plain textarea element

Thank you!

[github-actions]

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