feat : added tooltip to avatar, username,timeStamp

[AyushKumar123456789]

Add Tooltips for Avatar, Username, and Timestamp Hover

Acceptance Criteria fulfillment

• [ ] Display tooltips when hovering over the avatar icon, username, and timestamp.
• [ ] Tooltip content is context-specific (e.g., Dat and time for timestamps, Name for avatar and @ username for name text).
• [ ] Ensure tooltip behavior aligns with existing EmbeddedChat UI/UX.

Fixes #775

Video/Screenshots

https://github.com/user-attachments/assets/ab2245ee-af63-4e12-9d54-79aa9c2c78a8

PR Test Details

Note: The PR will be ready for live testing at https://rocketchat.github.io/EmbeddedChat/pulls/pr-<pr_number> after approval. Contributors are requested to replace <pr_number> with the actual PR number.

[CLAassistant]

All committers have signed the CLA.