Flow switch doesn't surface the new flow's stage — rotation-step click required

[mpstaton]

Context:

• Flow-Switch-Doesnt-Surface-The-New-Flows-Stage-Step-Bubble-Click-Required.md

Picking a flow from the Flows popdown should surface the new rotation's step 1 as if its bubble were clicked — persisted layout state currently keeps the stage stale until the manual bubble click.