#490 [Bug Fix] Accordion: sync docs Stimulus controller with gem

Fixes #489

Summary

• The gem's accordion controller was fixed in 0897b2a to toggle the hidden attribute on the content element in sync with the height animation.
• docs/app/javascript/controllers/ruby_ui/accordion_controller.js is a separate copy (docs bundles its own JS controllers) that was never updated after that fix, so the live preview at rubyui.com/docs/accordion never opened when clicked.
• Copied the gem's controller verbatim into the docs copy — confirmed byte-identical with diff.

The Accordion component in the gem itself was already correct; no gem changes needed.

Test plan

• Reproduced the bug on production (rubyui.com/docs/accordion): clicking a trigger did nothing.
• diff gem/lib/ruby_ui/accordion/accordion_controller.js docs/app/javascript/controllers/ruby_ui/accordion_controller.js → identical.
• Rebuilt docs assets (pnpm build) locally in the docs devcontainer, ran the Rails dev server, and manually verified in browser: trigger now opens (content reveals, chevron rotates) and closes (content hides, chevron resets) correctly.

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Summary by cubic

Sync the docs accordion Stimulus controller with the gem so accordion previews open and close correctly. Fixes #489.

• Bug Fixes
  • Replaced the docs controller with the gem version to toggle the hidden attribute in sync with the height animation.
  • Removes hidden before measuring height and re-applies it after the close animation to avoid layout/focus issues.