Move breadcrumb rendering from individual page templates into the core
topbar. Each page now sets $breadcrumbs in its action .php file; the
topbar renders it automatically via the shared partial.
- Remove global back/forward buttons and app-nav-history.js component
- Remove Alt+Arrow keyboard shortcuts for history navigation
- Render breadcrumb in topbar-left section (replaces button area)
- Clean up breadcrumb CSS: context-neutral base (flex, no margin)
- Recalculate sticky titlebar offset in details container
- Migrate all 41 pages (core + helpdesk, audit, addressbook, api-docs)
- Add missing breadcrumbs to addressbook detail view
- Update architecture contract tests (nav-history references removed)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
- 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>
