DS-064: Add a FormErrorSummary component

[IbrahimIjai]

Context

Complex order and liquidity forms can contain multiple validation failures.
Inline errors alone are difficult to scan and navigate after submission.

Scope

• Add a summary component that lists form errors and links to invalid fields.
• Focus the summary after a failed submit when configured.
• Support a concise title and optional correction guidance.
• Document integration with the shared Field component.

Acceptance criteria

• Error links move focus to the associated field.
• Summary count and title are announced once after failed submission.
• Dynamic error changes do not cause repeated disruptive announcements.
• Works when fields are inside a scrollable dialog.
• Tests cover linking, focus movement, updates, and empty state.

Out of scope

• Introducing a form-state library.
• Defining business validation rules.

[webdevayo]

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

Hello Maintainer, i'm an experienced full stack dev and i will like to work on this issue.
if you'll kindly assign, the issue will be resolved.
ETA: 5 Hours

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[precious-akpan]

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

Hello, I would like to resolve this issue, I have the experience.

Looking forward to working with the team.

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Congratulations, @precious-akpan! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on July 30, 2026.

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[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Official Campaign | FWC26 campaign!

@precious-akpan's PR #499 was approved and merged by @IbrahimIjai.

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

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This issue has been completed by @precious-akpan as part of the Stellar Wave Program's 7th Wave 🥳

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