Add Orbit beta badge and testing agreement notice

Update Orbit enablement/usage surfaces for Beta launch:

Key changes

• Adds explicit Beta agreement copy to the enablement modal
• Updates enablement modal copy per legal
• Adds 'Beta' badge to Orbit headers

Secondary changes

• Get started" button renamed to "Turn on" for consistency with the modal action
• Fixes alignment in settings page to better parallel the Orbit empty state

Empty state	Settings	In use	Enablement