Test build for:
- Added Czech translation
- Added drag-and-drop to move messages to another folder
- Added cross account copy/move mail - #108
- Added draggable recipients in composer - #111
- Added auto-commit recipient on lost focus - #85
- Added composer del/backspace guard to prevent accidental message delete
- Fixed detached composer system theme detection - #153
- Fixed launch flow - #154
- Fixed dark theme rendering - #155