Finalize site hub elements

[mtias]

Placement and interactions of the command center, site icon and view site actions.

Visual

Main Tasks

• Animate the site icon element between view and edit in the site editor #48886
• Command Center: Add a button to invoke the cmd+k interface in site view #50375
• Add action to "View Site" from the Site Editor sidebar #50405
• Consider adding back action for Site Editor Site Icon to navigate to WP Admin

Secondary Tasks

• Site Editor: the Site Icon partially hides the navigate region blue outline focus style #50288

[annezazu]

Added this to the phase 2 board as it's now listed as a main task on the Phase 2 issue. It's not clear to me what stage we're in: needing dev or design. I've added needs design for now. Feel free to update.

[mtias]

I'm closing this given there's not enough clarity on the "view site" action, which we can follow up on #50405.