[FEATURE] Sort session history by most recent activity (instead of creation)

[dobesv]

📋 Prerequisites

• I have searched the existing issues to avoid creating a duplicate
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📝 Feature Summary

Improve session history sort order

❓ Problem Statement / Motivation

Sometimes I have sessions that span several days and other times the session ends quickly. It can be hard to find active sessions because the session list is sorted by when the session was first created rather than the last time something happened in it.

💡 Proposed Solution

Update sort order in session history sidebar to "last updated" descending or similar.

🔄 Alternatives Considered

No response

🎯 Affected Service(s)

UI Service

📚 Additional Context

No response

🙋 Are you willing to contribute?

• I am willing to submit a PR for this feature