Align invitation sidebar UI with RocketChat

[Jeffrey Yu]

As an EmbeddedChat developer

I need to:
Align the UI of Invite Members sidebar with what we have in RocketChat

So That:
Users can have a better and consistent UX with member invitation. Currently,

• Invite link is long and often cut off, making it hard to copy
• Spacing and color are not consistent with those in RocketChat
• The back button is on the top right, which is not consistent with other UIs

The objective is to make the invitation sidebar looks and behaves similar to what we have in RocketChat:

Not sure if the Edit Invite feature is necessary in EmbeddedChat. Not included for now, but we can raise another issue.

Acceptance Criteria

• Add a copy button besides the invite link
• Make spacing and color consistent with those in RocketChat
• Move back button to the top left

[Jeffrey Yu]

Working on this

[Sidharth Mohanty]

Cool!