`CommandInput` sets `aria-expanded` to a boolean

• Where: command_input.rb, aria_expanded: true. Snapshot
  command/dialog line 18.
• Effect: same root cause as item 2; listed separately because the fix
  is a real state string ("false" at rest, toggled by the controller),
  not just "true".
• Fix: aria_expanded: "false" and have command_controller.js set it;
  re-record (on the 2.0 line) command/*.

Surfaced by the golden HTML suite (PR #536), which pins what 1.6 renders today — this defect included. Per maintainer decision (2026-09-19) main stays as is: this is addressed on the 2.0 line, and the golden snapshot that pins it is re-recorded there with the diff reviewed.

Source: design/v2/follow-up-issues.md.

Empieza en command_input.rb, en aria_expanded, e inspecciona command_controller.js para ver la actualización del estado. Ejecuta la golden HTML suite o el command/* snapshot, vuelve a grabarlo en la línea 2.0 y revisa el diff. Se considera terminado cuando el estado de reposo y el estado gestionado por el controlador usan las cadenas ARIA esperadas sin cambiar la línea 1.6.