Two UI fixes for the repository picker, reported on 5.2.0:
- Add repository now opens the folder browser directly. Before, it also opened the New-task compose sheet behind the browser — closing the browser left a stray task open.
- The folder browser's close (×) button rendered as a plain white box on some builds; it's now styled to match every other dialog. Added a base style so no overlay close button can regress to native white again.
Upgrade in place — no breaking changes.