Simpler, clearer two-level navigation:
- Sidebar: 9 flat section-level links (no toggling), active at section level
- Horizontal subnav: compact tab strip renders above content for sections
with multiple pages (Marketplace, Content, Email, System)
- Single-page sections (Dashboard, Suppliers, Billing, Analytics, Pipeline)
get no subnav — one click, you're there
- Sidebar active state uses active_section not admin_page, so any sub-page
correctly highlights its parent section
- Zero JS beyond the existing confirm dialog
- Unread badge remains on Email sidebar item + Inbox subnav tab
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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