[FEATURE] Implement End-to-End Encryption for Messages

[DeborahOlaboye]

Description

• Add encryption/decryption for messages before sending to smart contract
• Use WebCrypto API or libsodium for encryption
• Implement key exchange protocol between chat participants
• Store encryption keys securely in the wallet
• Add visual indicators for encrypted messages
• Include error handling for failed decryption

Acceptance Criteria

• Messages are encrypted before being sent to the blockchain
• Only intended recipients can decrypt messages
• Encryption keys are stored securely
• Visual indicators show message encryption status
• Graceful error handling for decryption failures

Technical Notes

• Consider using libsodium for encryption
• Need to handle key exchange between participants
• Should work with existing wallet infrastructure

[gboigwe]

Please @DeborahOlaboye assign this issue to me, I can fix it

[DeborahOlaboye]

Alright, assigned.