Provide quick way to swap alias into the primary name

A common editing operation for authors is to promote one of the the aliases to be the primary name and save the current primary name as an alias. The editing UI should provide a quick way to perform this swap with a single click without the user having to manually perform multiple cut-paste operations.

### Describe the problem that you'd like solved

### Proposal & Constraints

### Additional context

### Stakeholders

Start by locating the book-editing UI and the fields that manage a primary name and aliases. Trace how edits are saved, then define the change as a single action that promotes a selected alias while preserving the former primary name as an alias; verify the resulting values through the existing editing flow.

Written by the indexing model from the issue text.