[MindOfqc]

Refs #8231.

Add closeAriaLabel to NDialog and useDialog options so applications can provide a localized accessible name for the default close button. It defaults to close and can be updated reactively. The existing custom close slot keeps its behavior.

The main-branch button already has the English label close; this addresses the issue's request for a supported way to customize that label. Both API documentation languages and changelogs are updated.

Validation:

• The two new regressions fail on the original implementation: both the direct component and useDialog keep aria-label="close" instead of the supplied name.
• 18 dialog tests passed, including reactive updates and fallback to the default label.
• TypeScript checking for the dialog test and its imported production graph passed.
• Changed-file ESLint and the normal Husky/lint-staged commit hook passed (Prettier and ESLint for all seven changed files).

Tests used Node 24.21.0, Vue 3.5.44, and Vitest 4.1.12 in a small isolated dependency environment. The test config retains the repository's classic h JSX transform, jsdom, and src/vitest-setup.ts; it omits the docs plugins and JSX Vapor plugin because the latter fails at startup on Windows with a file:///vue-jsx-vapor/vdom resolution error. The full default pnpm test command and browser/screen-reader acceptance have not been verified. Dependency auto-install was set to warn locally while running the normal commit hook; that local setting is not included in the PR.

Prepared with AI assistance.