fix(catalog): keep quick-nav aria-label i18n-reactive

The category quick-nav's <nav aria-label> was set only at render time, so
a later language switch left it stale (applyTranslations only updates
elements carrying data-i18n-aria). Add data-i18n-aria="nav.categoryJump"
so the label follows the active language, matching the chips. Addresses
CodeRabbit review on #549.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: raifdmueller

website/src/components/card-grid.js

@@ -121,7 +121,11 @@ function renderCategoryNav(categories, allAnchors) {
     .join('')
 
   return `
-    <nav class="category-nav" aria-label="${escapeHtml(i18n.t('nav.categoryJump'))}">
+    <nav
+      class="category-nav"
+      aria-label="${escapeHtml(i18n.t('nav.categoryJump'))}"
+      data-i18n-aria="nav.categoryJump"
+    >
       <ul class="category-nav-list">${links}</ul>
     </nav>
   `

website/src/components/card-grid.test.js

@@ -109,6 +109,8 @@ describe('category quick-nav', () => {
     expect(html).toContain('class="category-nav"')
     expect(html).toContain('href="#category-testing-quality"')
     expect(html).toContain('href="#category-design-principles"')
+    // nav label must stay i18n-reactive on language switch
+    expect(html).toContain('data-i18n-aria="nav.categoryJump"')
   })
 
   it('omits categories with no non-umbrella anchors from the nav', () => {