feat(OnyxSelectInput): support validation

[BoppLi]

Relates to #1302

• feat(createComboBox): open flyout on text input for searchable combo boxes. Fix close/open bug when selecting with space
• feat(OnyxSelectInput): support validity handling
  • internal input is not readonly, but blocks all character inputs
  • supports translated error message for empty required inputs
  • align styles
• feat(global.css): include layers order to prevent hierarchy issues

Checklist

• [x] The added / edited code has been documented with JSDoc
• [x] If a new component is added, at least one Playwright screenshot test is added
• [x] A changeset is added with npx changeset add if your changes should be released as npm package (because they affect the library usage)

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: b00586c6d1ee11588f95fc0a46787b1ec541ec19

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 8 packages

| Name | Type | | ------------------------- | ----- | | @sit-onyx/headless | Minor | | sit-onyx | Minor | | alpha-test-app | Patch | | playground | Patch | | @sit-onyx/chartjs-plugin | Major | | @sit-onyx/nuxt | Major | | @sit-onyx/storybook-utils | Major | | @sit-onyx/vitepress-theme | Major |

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