Fix message duplication and improve chat room handling

[spline2hg]

Message Duplication Fix and Chat Improvements

Problem

Users experienced message duplication when clicking on chat rooms multiple times. This was caused by:

1. Redundant message loading from both local storage and server

Solution

This PR implements a comprehensive fix for message handling:

Client Changes

• Prevent unnecessary room reloading
• Use server as single source of truth for messages

Server Changes

• Add new endpoint /get_all_messages for complete history

Testing Done

• Manually verified no message duplication occurs
• Tested room switching with various message loads
• Verified backward compatibility with existing features

Please review the code thoroughly for any potential issues or improvements, as I'm still learning and appreciate any feedback

[KorryKatti]

will take a look into it and it will approve/disapprove in an hour

[spline2hg]

ok yeah ,great

[KorryKatti]

checked to be working , merging now

Thank you for your PR

[spline2hg]

yeah cool man