Add "Announcement Banner" for important information to Agents

It would be good to be able to alert all agents or certain teams when there is important information, for example when there are service disruptions, ongoing campaigns, or other important updates.

The banner should be visible at the top of the agent interface, with the option to target specific teams or select "All" to reach everyone.

This would be a simple and effective way to make sure everyone concerned sees important information, rather than relying on messages in shared Teams or Slack channels, where updates can easily get lost.

Suggested functionality:

• Create and publish information banners.

• Choose whether the banner should be visible to all agents or selected teams.

• Optionally set a start and end time for the banner.

• Allow agents to acknowledge that they have read the information.