Implement net.Receive handler to open the announcement admin menu when triggered by the server. This allows server-side code to remotely open the admin menu on client instances.
Implement a custom GUI menu for administrators to send announcements with the following features:
- Support for announcement presets that auto-fill title and message fields
- Real-time character count validation with visual feedback
- Warning indicator when message exceeds max length limit
- Custom styled text input fields with placeholder text
- Rounded corners and custom color scheme matching announcement styling
- Close button and ESC key handling
- Network message handling to send announcements to server
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