Draft: Initial context switcher

What does this MR do and why?

Explores adding the context switcher concept from Project Sneak Peek.

Updated and remixed with @aregnery POC (!215801)

Screenshots or screen recordings

How to set up and validate locally

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Related to #548836 (closed)