Notes in messanger

We propose adding a private notes field to the message sending interface. This would allow users to attach personal notes to each message they send. These notes would be visible only to the sender when reviewing sent messages, providing a secure way to store context or reminders related to specific communications. This feature aims to enhance message management, improve follow-up efficiency, and maintain user privacy. Implementation should focus on a clear UI distinction from the main message and strict access controls to ensure note privacy.