[draft] Improve UX - decrease the touch button press count

[szszszsz]

As a user I would like to have it less troublesome to edit and create secret credentials in Nitrokey 3 using Nitrokey App 2.

1. Creating secret credential
2. Modifying ----
3. That's all with Nitrokey App 2.

Proposed solutions:

1. FIDO2-like session token, based on PIN and the touch state
2. Touch button "latching" (keep it 5 seconds pressed without active user press)
3. Anything else?

Check threat analysis for the design, and original intent of the touch confirmation.

• https://github.com/Nitrokey/trussed-secrets-app/blob/main/docs/design.md

Contact with Janos regarding Nitrokey App2 for the implementation ideas.

[szszszsz]

User comment from the "Nitrokey" main channel:

I don't really understand when the NK-App2 asks for a touch. I haven't set "Require Touch" on any password. but it asks everytime I want to do something for a touch. Saving changes to a password required three times touch?!
Is this an issue? It's a bit annoying.

[daringer]

please also include this one into the scope of the upcoming PR: #108