Add "open all changes files in editor" option

### The feature request

Add option to open all changes files in editor. Something like an option menu when right clicking the "X changes files" text.

### Proposed solution

I think this could be a beneficial feature to quickly open up all changed files (and having Desktop open on another monitor or something) to see the full context of how the files were changed.

### Additional context

_No response_

No files, tests, or entry points are named in the issue. Start by locating the changed-files UI and its right-click context menu, then trace how the app opens files in the configured editor. Done means an option opens every changed file and behaves correctly when selected.

Written by the indexing model from the issue text.