[Feature request] Announcement message box

[samaphp]

Add a customizable announcement box where admins can set a message for users.

Features:

• Free Text Input: Admin-defined message text. Supports multilines.
• Styling Options: Background color selection for alerts (e.g., red) or info (e.g., blue) to indicate importance.

Purpose: Provides an easy way for admins to communicate key information to users.