feat(ConversationIcon): highlight public conversations

[Antreesy]

☑️ Resolves

• Conversation (NcListItem) now indicates, if conversation is public (available for guests by link)

• Place is details above the unread counter

• To discuss:

  • Icon for federated conversations:
    • Same place?
    • Should overwrite public icon?
    • Which icon to use? https://pictogrammers.com/library/mdi/icon/shield-link-variant/ as option

🖌️ UI Checklist

🖼️ Screenshots / Screencasts

🌞 Light theme	🌑 Dark theme
Default with --color-primary-element-text for active	--color-text-maxcontrast for others

🏁 Checklist

• 🌏 Tested with Chrome, Firefox and Safari or should not be risky to browser differences
• 🖌️ Design was reviewed, approved or inspired by the design team

[marcoambrosini]

I think we should avoid adding this information on the avatar @Antreesy
Let me think about this and will come up with an alternative proposal soon.

[Antreesy]

Rebased and updated screenshots.
Don't think that group conversations require that 'multiple-account' icon, to not overwhelm the sidebar, but we could discuss that

[DorraJaouad]

Code-wise, it's fine ✅
We can keep the same icon for federated conversations or it should be changed for some reason ?

[marcoambrosini]

I think it would be nice info @Antreesy , shouldn't overwhelm much

[marcoambrosini]

@Antreesy could we use the same color as the title for those icons?

[Antreesy]

same color as the title

This would differ from the default color (which was picked for the component in the library), so we kept it as-is for now