[Chore] Remove unused components / features from docs

[kodster28]

Remove the unusued component Checkbox, as well as unused functionality introduced by Dismissable.tsx.

[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
*.astro	@cloudflare/content-engineering, @kodster28
/src/components/	@cloudflare/content-engineering, @kodster28
*.ts	@cloudflare/content-engineering, @kodster28
/src/content/docs/style-guide/	@dcpena, @caley-b, @cloudflare/product-owners

[ask-bonk]

1 issue needs fixing before merge.

HIGH — src/components/overrides/Banner.astro line 33: The class="min-w-[1.333em]" attribute was accidentally removed from the <Icon> component when the dismissible branch was deleted. This is a visual regression — the icon will no longer maintain its minimum width in flex layouts.

LOW — PR description has typos: "unusued" should be "unused", and "Dismissable" should be "Dismissible" (matching the filename).

Otherwise, the deletions are clean: no remaining references to Checkbox, Dismissible, or dismissible frontmatter property exist in the codebase. Type-check, lint, and format checks all pass.

[ask-bonk]

Suggested fix for src/components/overrides/Banner.astro line 33:

				{icon && <Icon name={icon} size="1.333em" class="min-w-[1.333em]" />}

[ask-bonk]

I reviewed PR #30880 and applied the labels engineering and documentation.

Summary of changes:
The PR removes two unused pieces of code from the docs site:

1. Checkbox.astro — a custom web component that rendered checkboxes with localStorage persistence.
2. Dismissible.tsx — React hooks/components for dismissible UI elements (used by banner).

It also cleanly removes the associated banner dismissible logic from Banner.astro, removes the export from the components barrel file, updates the style guide docs to remove the dismissible section, and removes the dismissible property from the Zod schema.

Issues flagged:

HIGH — src/components/overrides/Banner.astro line 33: When the dismissible branch was deleted, the class="min-w-[1.333em]" attribute was accidentally dropped from the <Icon> component. This is a visual regression. I posted the exact one-line fix in a comment.

LOW — PR description has typos: "unusued" should be "unused" and "Dismissable" should be "Dismissible".

Validation:

• pnpm run check — passed (0 errors)
• pnpm run lint — passed
• pnpm run format:core:check — passed
• No remaining references to Checkbox, Dismissible, or dismissible frontmatter in the codebase.

github run

[github-actions]

Preview URL: https://2fdf6aad.preview.developers.cloudflare.com
Preview Branch URL: https://code-cleanup.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/style-guide/frontmatter/banner/	https://code-cleanup.preview.developers.cloudflare.com/style-guide/frontmatter/banner/