Split chat responses and legacy responses on /search screen

[mathewjordan]

This work creates tabbing on the Search screen allowing a user to toggle between the streamed AI response and the legacy search results.

A few things:

• Tabbing is controlled at the search context level to better maintain control over the active view.
• Updating search input should always reset the tab to the stream view if AI response is toggled on
• Updating facets on the results screen will should not reset the tab
• An actions bar will render below the streamed response upon completion, giving the user avenues to view the results or ask another question

[adamjarling]

Works great! Looks awesome... let's get this in. 👍