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The flat top bar was a set of ungrouped peers and gave plugin data no home. Move to a persistent left sidebar with grouped sections, per the navigation redesign (operator-chosen shell). - base.html: top <nav> → left <aside class="sidebar"> + content column. Groups: Overview (Dashboard, Status), Infrastructure (Hosts; plugin links arrive in slice 2), Monitoring (Monitors, Alerts), Automation (Ansible), Admin (Settings, Audit; admin-only). Brand on top, user/logout at the bottom. - Active link highlighted by request.path prefix (aria-current). - Responsive: sidebar slides off-canvas under 900px via a ☰ toggle + scrim (inline class toggle, no new JS deps). Candle-glow preserved. - Logged-out pages (login/setup) render without the sidebar (gated on session.user_id), content area full-width and centered as before. - Add tests/test_templates_parse.py: syntax-parses every steward template so a broken tag fails the unit lane (only the login page renders there today). Plugin nav links (Docker/SNMP/UniFi/Traefik) come next in slice 2 via a get_nav hook. UI-only; no behavior/route changes. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_016Jg27rgypiW2efULXJDtMC