- Add Kiro to OPEN_IN_APPS list with id 'kiro' and appName 'Kiro'
- This enables users to open files and projects directly in Kiro IDE
via the Open in menu, similar to VS Code, Cursor, and Windsurf
* feat: open focused file in selected desktop app
* fix: make file tree indicators match active open tabs
* fix: limit preview functionality to markdown files only
* feat: add Open In action to file editor toolbar. add antigravity to openin app list