DS-057: Extract a shared Accordion component

[IbrahimIjai]

Context

The Referrals FAQ has a feature-local accordion. Other educational and settings
views should not reimplement disclosure behavior.

Scope

• Add shared single-open and multiple-open accordion modes.
• Support disabled items, heading-level configuration, and controlled state.
• Move generic animation and icon treatment into the shared component.
• Provide a migration example for the Referrals FAQ.

Acceptance criteria

• Triggers are real buttons inside semantic headings.
• Enter, Space, and sequential keyboard navigation work.
• Content IDs and expanded states are programmatically connected.
• Reduced-motion behavior is respected.
• Tests cover single, multiple, controlled, disabled, and keyboard states.

Out of scope

• Rewriting FAQ copy.
• Adding remote content loading.

[oyeyemidavid-gif]

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Please I'd love to work on this issue.

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[dot-enny]

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Hello maintainer, I'd like to work on this please. Thank you.

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[emarkees]

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Hi, I can help you fix this issue

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[Oluwatomilola]

@Oluwatomilola has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi Maintainer.
I can fix this issue. kindly assign.

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[cythecode]

@cythecode has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hello maintainer, i’ve got this covered! Ready to drop a high-impact, clean PR that gets this merged seamlessly

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[grantfox-oss]

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@Oluwatomilola's PR #497 was approved and merged by @IbrahimIjai.

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👏 Great work, @Oluwatomilola! Keep contributing to SO4-Markets.

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