We need a current segment selector, by default will be the "Default" segment.
Proposed resolution
We need a current segment selector (visible only based on feature flag)
This segment selector should show existing segments sorted by weight.
This segment selector should set the "active segment" on the redux store, so we can e.g. flag when the "personalize" button will show/which personalization case needs to be render on the preview + layer panel.
User interface changes
A beautiful selector is on the top for selecting the active segment in the editor.
