Chatbot: Filter/Sorting

Feature request from Rohit and team:
Ability to sort conversations: In Developer Lightspeed we would like to have an ability to sort conversations in the navigation sidebar

<img width="330" height="426" alt="Image" src="https://github.com/user-attachments/assets/a4440fe7-0550-45e4-be6a-7d74bcfa1533" />

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**Jira Issue:** [PF-2967](https://issues.redhat.com/browse/PF-2967)