chore(ui): ux docs modal action button labels

[franzheidl]

Summary

Clarify guideliens for labels on Modal confirming action buttons, update stories accordingly.

Related Issues

Closes #1923

Checklist

• I have performed a self-review of my code.
• I have commented my code, particularly in hard-to-understand areas.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.
• I have made corresponding changes to the documentation (if applicable).
• My changes generate no new warnings or errors.
• I have created a changeset for my changes.

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Latest commit: 9723b1f

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[github-actions]

PR Preview Action v1.8.1
Preview removed because the pull request was closed.
2026-08-27 13:56 UTC

[Copilot]

Pull request overview

Updates the UX writing guidelines and Storybook Modal examples to clarify/standardize confirming action button labels (per #1923), including title-casing “Register Now” in existing Modal stories.

Changes:

• Updated Modal form stories to use confirmButtonLabel: "Register Now" (capitalized “Now”).
• Expanded UX writing guidelines with a new section on confirming buttons in modals, with “Do” and fallback examples.
• Adjusted the “button label in copy” example formatting.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
packages/ui-components/src/components/Modal/Modal.stories.tsx	Aligns Modal confirm button label casing with the updated writing guidance/issue requirements.
docs/ux/ux-writing-content-design.md	Adds clearer guidance for Modal confirming button labels and supporting examples.

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