Add Cancel/Dismiss pseudo-skill

[tylxr59]

Adds a cancel/dismiss pseudo-skill so users can dismiss the assistant after intentional or unintentional activation.

Also sets up a hidden skills section so it doesn't show up in Settings or on the What I Can Do card.

Resolves #334

[tylxr59]

Merged all of my PRs into one branch on my fork - https://github.com/tylxr59/dicio-android/tree/tylxrs-build
Compiled APK for testing - https://github.com/tylxr59/dicio-android/raw/refs/heads/tylxrs-build/app-debug.apk

[pablowako]

Great work, I'm looking forward to this merge!

Consider adding "no" as an option, since you have "no thanks" and a good candidate reply to "did you mean to call X?" is simply "no".

Also, why hide the skill? I'd like to know, when I'm new to the app, that this is possible, as well as the words that trigger it. Maybe add it to some note or otherwise document it inside the app?

[pablowako]

I don't mean to come across as rude. These are legitimate questions.