`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.

从 command_input.rb 中的 aria_expanded 开始，检查 command_controller.js 中的状态更新。运行 golden HTML suite 或 command/* snapshot，然后在 2.0 线上重新记录并检查 diff。完成的标准是静止状态和由控制器管理的状态使用预期的 ARIA 字符串，同时不更改 1.6 线。