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**Related issue:** Resolves #
# Checklist for submitter
If some of the following don't apply, delete the relevant line.
- [x] Changes file added for user-visible changes in `changes/`,
`orbit/changes/` or `ee/fleetd-chrome/changes`.
See [Changes
files](https://github.com/fleetdm/fleet/blob/main/docs/Contributing/guides/committing-changes.md#changes-files)
for more information.
## Testing
- [x] Added/updated automated tests
- [x] QA'd all new/changed functionality manually
<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit
* **New Features**
* Redesigned in-app notifications with a new toast-based UI style.
* Error messages are now dismissible and expandable to reveal detailed
server response information.
* Success and error notifications now appear consistently across the
application with improved visibility.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Marko Lisica
977d8e8d73