[DRAFT] feat(NcPopover): add fullscreen mobile mode

[ShGKme]

☑️ Resolves

• Add classic mobile menu mode for NcPopover
  • Optional
  • Enabled for NcActions by default

🖼️ Screenshots

🏚️ Before	🏡 After

🏁 Checklist

• [ ] ⛑️ Tests are included or are not applicable
• [x] 📘 Component documentation has been extended, updated or is not applicable
• [ ] 3️⃣ Backport to next requested with a Vue 3 upgrade

[ShGKme]

@marcoambrosini Do you think it looks fine, of we should increase the size of action items on mobile?

[marcoambrosini]

Let's try it like this, but maybe in the future it would be wise to have the --clickable-area variable return a slightly bigger value on mobile