- Replace the quick chat header mode toggle with a session picker dropdown styled from dashboard theme tokens
- Surface chat room entries alongside sessions and keep active room/session switching in the same menu
- Add QuickChatFAB and CSS regression coverage for the new dropdown behavior and token-based styling
- Add a changeset note for the quick chat session picker update
Fusion-Task-Id: FN-4611
Fusion-Task-Id: FN-4634
Fusion-Task-Lineage: 87cc75e7-ba50-4cb5-bb9f-6d86f49268e0
