* fix(app): preserve workspace tabs and acknowledge deliberate agent focus
Workspace navigation no longer chooses an attention agent. Preserve repeated focus actions so an already selected chat can be acknowledged, and stop consuming attention on departure.
* fix(app): retain deliberate focus until fresh agent data arrives
Connection readiness permits a pending focus acknowledgement without creating a new focus action. Keep that intent across client changes and wait for the current timeline synchronization generation before consuming it.
* fix(app): preserve reconnect feedback during attention acknowledgement