Add src/admin/ui/SidebarNav.tsx: drawer content component using MUI
List/ListItemButton with NavLink polymorphism. Active item uses the
`selected` prop for the white "pill" styling (not NavLink active class).
Renders logo header, permission-filtered nav sections, and user/logout
footer. Not yet wired — next task mounts it in a Drawer.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Move MenuItem/MenuSection interfaces and the full menuSections array (6 sections,
~30 items with inline SVG icons) verbatim from Sidebar.tsx into src/admin/ui/navData.tsx.
Add exported isItemActive/hasItemPermission pure helpers (folding in the matchAlso
branch that was previously inline in Sidebar's NavLink className callback).
Sidebar updated to import and use these; rendering and active-state behavior unchanged.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Wraps AdminApp in MuiProvider (ThemeProvider v7, defaultMode=dark) and
adds MuiColorSchemeSync to mirror ThemeContext's data-theme attribute
into MUI's JS color-scheme state so useColorScheme().mode stays in sync.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
