<!-- Add the related story/sub-task/bug number, like Resolves#123, or
remove if NA -->
**Related issue:** #49325
# Checklist for submitter
- [x] Timeouts are implemented and retries are limited to avoid infinite
loops
## Testing
- [x] Added/updated automated tests
- [x] QA'd all new/changed functionality manually
## fleetd/orbit/Fleet Desktop
- [x] If the change applies to only one platform, confirmed that
`runtime.GOOS` is used as needed to isolate changes
macOS-only by construction — this is the native macOS app, which has no
other platform build.
No changes file: this app ships on its own release channel
(fleet-desktop-macos-v* → download.fleetdm.com), not the Fleet server
changelog, matching every previous PR to apps/fleet-desktop-macos/.
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Added macOS notification support through the `notify` command.
* Notifications appear as bottom-right toast messages with loading,
dismissal, timeout, and error handling.
* Added URL validation, clear usage guidance, and meaningful
command-line exit statuses.
* Notification commands can run without opening the main app.
* **Bug Fixes**
* Improved single-instance handling for background notification
processes.
* Improved detection of Fleet-rendered error pages.
* **Tests**
* Added developer tools for notification smoke testing and local
invocation.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Marko Lisica
678d8b77ff