- Replace <div>+<i> structure with <nav aria-label>+<ol>+<li>
- Move separators from DOM to CSS pseudo-elements (li+li::before)
- Add hover/focus-visible states and color differentiation
- Replace hard-coded px values with design tokens
- Explicitly reset shell nav/ol/li rules for self-contained styling
- Add i18n key for breadcrumb nav landmark label
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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