fix: add a11y tests for code components, fix type and lint issues

Author: alex-key

test/nuxt/a11y.spec.ts

@@ -146,7 +146,9 @@ import {
   ChartPatternSlot,
   CodeDirectoryListing,
   CodeFileTree,
+  CodeHeader,
   CodeMobileTreeDrawer,
+  CodeSkeletonLoader,
   CodeViewer,
   CopyToClipboardButton,
   CollapsibleSection,
@@ -1158,6 +1160,36 @@ describe('component accessibility audits', () => {
     })
   })
 
+  describe('CodeHeader', () => {
+    it('should have no accessibility violations', async () => {
+      const component = await mountSuspended(CodeHeader, {
+        props: {
+          html: '<pre><code><span class="line">const x = 1;</span></code></pre>',
+          filePath: 'dir1/dir2/sourcefile.js',
+          loading: false,
+          isViewingFile: true,
+          isBinaryFile: false,
+          fileContent: '<pre><code><span class="line">const x = 1;</span></code></pre>',
+          markdownViewMode: 'preview',
+          selectedLines: null,
+          getCodeUrlWithPath: path => path,
+          packageName: 'vite',
+          version: '1.0.0',
+        },
+      })
+      const results = await runAxe(component)
+      expect(results.violations).toEqual([])
+    })
+  })
+  
+  describe('CodeSkeletonLoader', () => {
+    it('should have no accessibility violations', async () => {
+      const component = await mountSuspended(CodeSkeletonLoader)
+      const results = await runAxe(component)
+      expect(results.violations).toEqual([])
+    })
+  })
+
   describe('CodeViewer', () => {
     it('should have no accessibility violations', async () => {
       const component = await mountSuspended(CodeViewer, {