fix(a11y): improve accessibility for Lighthouse score

[Ibochkarev]

Improve nuxt.com accessibility to raise Lighthouse a11y score from 83 toward 100 and address automatically detectable and manual a11y issues.

Motivation: Issue #1837 reports current Lighthouse a11y score of 83; the comment from @timdamen (Nov 2025) suggests using the nuxt/a11y module for auto-detection and fixing non-automatic issues.

Changes:

• @nuxt/a11y: Add module (dev, alpha) for axe-core–based checks and DevTools integration.
• Skip link: Add “Skip to main content” link (visually hidden, visible on focus) and id="main-content" on UMain for keyboard/screen-reader users.
• Images: Add descriptive alt to deploy index and deploy [slug] NuxtImg logos (deployment.title / provider.title + “ logo”).
• UInputCopy: Replace generic aria-label="copy button" with a contextual label (e.g. “Copy command to clipboard” or “Copy <label> to clipboard”).
• Tests: Add two browser tests for skip link (presence, href, target #main-content, and that clicking it scrolls main into view).

Note: Browser tests run against BASE_URL (default https://nuxt.com); the new skip-link tests will pass after this is deployed or when run with a local BASE_URL.

Fixes #1837

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: ebeab627-c9e7-4ba0-849c-f942af34808c

📥 Commits

Reviewing files that changed from the base of the PR and between d38ce2d and eba8007.

⛔ Files ignored due to path filters (1)

• pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml

📒 Files selected for processing (7)

• app/components/UInputCopy.vue
• app/layouts/default.vue
• app/pages/deploy/[slug].vue
• app/pages/deploy/index.vue
• nuxt.config.ts
• package.json
• test/browser/interactions.spec.ts

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📝 Walkthrough

Walkthrough

This pull request enhances application accessibility by implementing WCAG compliance improvements across multiple components and the layout system. Changes include adding a skip-to-main-content navigation link in the default layout, introducing dynamic aria-labels based on component state in the copy input component, adding alt text attributes to image elements, installing the @nuxt/a11y accessibility module, and adding browser tests to verify skip link functionality. The modifications span configuration files, layout and component templates, and test suites.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~22 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the main objective of improving accessibility to raise the Lighthouse a11y score, which is the primary goal of all changes in the changeset.
Description check	✅ Passed	The description comprehensively details all accessibility improvements made, including the @nuxt/a11y module, skip link implementation, image alt text additions, aria-label updates, and test additions, directly relating to the changeset.
Linked Issues check	✅ Passed	The PR successfully addresses issue #1837 by improving accessibility with @nuxt/a11y module integration, skip link implementation, alt text for images, and improved aria-labels to raise the Lighthouse a11y score.
Out of Scope Changes check	✅ Passed	All changes are directly in scope with issue #1837's goal of improving accessibility: @nuxt/a11y module, skip link, image alt attributes, aria-labels, and related tests are all accessibility-focused.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[Ibochkarev]

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