Fix arrow redirection for starred messages not currently loaded

[Abhishek2005-ard]

Summary

Fixes an issue where arrow navigation in the Starred Messages view fails for messages that are not currently visible in the message list.

Changes

Added a reusable scroll helper to navigate to messages Updated starred message store to load messages on demand Wired arrow click to fetch and scroll to the selected message Ensured message elements have DOM ids for scrolling

How to Test

1. Open a room with long history
2. Star a message far up in the history
3. Reload the app
4. Open Starred Messages
5. Click the arrow icon
6. Message loads and scrolls into view

Fixes #871