feat(cms): add nav drawer to CmsLayout

Add a MudDrawer with app-bar toggle linking Catalogue, Releases, Upload, SuperRegister, and the self-gating UserAdminMenu fragment so user-admin pages are reachable.

DeepDrftManager/Components/Layout/CmsLayout.razor

@@ -1,5 +1,6 @@
 @inherits LayoutComponentBase
 @using DeepDrftShared.Client.Common
+@using AuthBlocksWeb.Components.Layout
 
 <MudThemeProvider IsDarkMode="false" Theme="@DeepDrftPalettes.Cms" />
 <MudPopoverProvider />
@@ -8,6 +9,10 @@
 
 <MudLayout>
     <MudAppBar Dense="true" Elevation="1" Color="Color.Primary">
+        <MudIconButton Icon="@Icons.Material.Filled.Menu"
+                       Color="Color.Inherit"
+                       Edge="Edge.Start"
+                       OnClick="ToggleDrawer" />
         <MudText Typo="Typo.h6" Class="ml-3" Style="font-family: 'DM Sans', sans-serif; letter-spacing: 0.05em;">
             Deep Drft — Admin
         </MudText>
@@ -18,6 +23,15 @@
                            Color="Color.Inherit" />
         </MudTooltip>
     </MudAppBar>
+    <MudDrawer @bind-Open="_drawerOpen" Elevation="2" Variant="DrawerVariant.Responsive" ClipMode="DrawerClipMode.Always">
+        <MudNavMenu>
+            <MudNavLink Href="/catalogue" Match="NavLinkMatch.All" Icon="@Icons.Material.Filled.Dashboard">Catalogue</MudNavLink>
+            <MudNavLink Href="/releases" Match="NavLinkMatch.Prefix" Icon="@Icons.Material.Filled.LibraryMusic">Releases</MudNavLink>
+            <MudNavLink Href="/tracks/upload" Match="NavLinkMatch.Prefix" Icon="@Icons.Material.Filled.UploadFile">Upload</MudNavLink>
+            <UserAdminMenu />
+            <MudNavLink Href="/account/superregister" Match="NavLinkMatch.Prefix" Icon="@Icons.Material.Filled.PersonAdd">Provision User</MudNavLink>
+        </MudNavMenu>
+    </MudDrawer>
     <MudMainContent Class="pt-14 pb-8">
         <MudContainer MaxWidth="MaxWidth.False" Class="pa-4">
             @Body
@@ -25,6 +39,12 @@
     </MudMainContent>
 </MudLayout>
 
+@code {
+    private bool _drawerOpen = true;
+
+    private void ToggleDrawer() => _drawerOpen = !_drawerOpen;
+}
+
 <div id="blazor-error-ui" data-nosnippet>
     An unhandled error has occurred.
     <a href="." class="reload">Reload</a>