fix(routing): InteractiveServer routing, WASM interactivity declared at layout level

Routes moves to InteractiveServer so the server router always sees all
assemblies (including AuthBlocksWeb). MainLayout declares
@rendermode InteractiveWebAssembly — the single source of WASM
interactivity for all public pages. CmsLayout in DeepDrftCms provides
a server-rendered admin shell without the audio dock. Assembly-level
_Imports.razor files set the default layout for each group; no per-page
rendermode declarations needed. Routes.razor moves to the server host
(its correct home) carrying the full AdditionalAssemblies list.

DeepDrftCms/Layout/CmsLayout.razor

@@ -0,0 +1,70 @@
+@rendermode InteractiveServer
+@inherits LayoutComponentBase
+
+<MudThemeProvider IsDarkMode="false" Theme="@_theme" />
+<MudPopoverProvider />
+<MudDialogProvider />
+<MudSnackbarProvider />
+
+<MudLayout>
+    <MudAppBar Dense="true" Elevation="1" Color="Color.Primary">
+        <MudText Typo="Typo.h6" Class="ml-3" Style="font-family: 'DM Sans', sans-serif; letter-spacing: 0.05em;">
+            Deep Drft — Admin
+        </MudText>
+        <MudSpacer />
+        <MudTooltip Text="Back to site">
+            <MudIconButton Icon="@Icons.Material.Filled.Home"
+                           Href="/"
+                           Color="Color.Inherit" />
+        </MudTooltip>
+    </MudAppBar>
+    <MudMainContent Class="pt-14 pb-8">
+        <MudContainer MaxWidth="MaxWidth.False" Class="pa-4">
+            @Body
+        </MudContainer>
+    </MudMainContent>
+</MudLayout>
+
+<div id="blazor-error-ui" data-nosnippet>
+    An unhandled error has occurred.
+    <a href="." class="reload">Reload</a>
+    <span class="dismiss">🗙</span>
+</div>
+
+@code {
+    // Light palette from MainLayout — keeps the CMS visually consistent with the public site.
+    private readonly MudTheme _theme = new()
+    {
+        PaletteLight = new PaletteLight
+        {
+            Primary           = "#0D1B2A",
+            PrimaryDarken     = "#162437",
+            Secondary         = "#1A3C34",
+            Tertiary          = "#3D7A68",
+            Background        = "#FAFAF8",
+            BackgroundGray    = "#F0F2F0",
+            Surface           = "#FAFAF8",
+            AppbarBackground  = "#0D1B2A",
+            AppbarText        = "#FAFAF8",
+            TextPrimary       = "#0D1B2A",
+            TextSecondary     = "#8A9BB0",
+            Divider           = "rgba(13,27,42,0.10)",
+            TableLines        = "rgba(13,27,42,0.10)",
+        },
+        Typography = new Typography
+        {
+            Default    = new DefaultTypography  { FontFamily = new[] { "DM Sans",             "sans-serif" } },
+            H1         = new H1Typography       { FontFamily = new[] { "Cormorant Garamond",  "Georgia", "serif" } },
+            H2         = new H2Typography       { FontFamily = new[] { "Cormorant Garamond",  "Georgia", "serif" } },
+            H3         = new H3Typography       { FontFamily = new[] { "Cormorant Garamond",  "Georgia", "serif" } },
+            H4         = new H4Typography       { FontFamily = new[] { "Cormorant Garamond",  "Georgia", "serif" } },
+            H5         = new H5Typography       { FontFamily = new[] { "Cormorant Garamond",  "Georgia", "serif" } },
+            H6         = new H6Typography       { FontFamily = new[] { "Cormorant Garamond",  "Georgia", "serif" } },
+            Subtitle1  = new Subtitle1Typography{ FontFamily = new[] { "Geist Mono",          "monospace" } },
+            Body1      = new Body1Typography    { FontFamily = new[] { "DM Sans",             "sans-serif" } },
+            Body2      = new Body2Typography    { FontFamily = new[] { "DM Sans",             "sans-serif" } },
+            Caption    = new CaptionTypography  { FontFamily = new[] { "Geist Mono",          "monospace" } },
+            Button     = new ButtonTypography   { FontFamily = new[] { "Geist Mono",          "monospace" } },
+        }
+    };
+}

DeepDrftCms/_Imports.razor

@@ -12,3 +12,4 @@
 @using DeepDrftData
 @using Models.Common
 @using MudBlazor
+@layout DeepDrftCms.Layout.CmsLayout

DeepDrftWeb.Client/Layout/MainLayout.razor

@@ -1,4 +1,5 @@
-@using DeepDrftWeb.Client.Controls
+@rendermode InteractiveWebAssembly
+@using DeepDrftWeb.Client.Controls
 @using DeepDrftWeb.Client.Controls.AudioPlayerBar
 @using DeepDrftWeb.Client.Services
 @using DeepDrftWeb.Client.Common

DeepDrftWeb.Client/Routes.razor

@@ -1,24 +0,0 @@
-@inject NavigationManager NavigationManager
-
-<Router AppAssembly="typeof(_Imports).Assembly">
-    <Found Context="routeData">
-        <AuthorizeRouteView RouteData="routeData" DefaultLayout="typeof(Layout.MainLayout)">
-            <NotAuthorized>
-                @{
-                    NavigationManager.NavigateTo($"account/login?returnUrl={Uri.EscapeDataString(NavigationManager.Uri)}", forceLoad: true);
-                }
-            </NotAuthorized>
-        </AuthorizeRouteView>
-    </Found>
-    <NotFound>
-        @{
-            // Routes owned by server-side assemblies (e.g. /account/*) are not visible to the
-            // WASM router. Force a full-page reload so the server router handles them instead.
-            var path = new Uri(NavigationManager.Uri).AbsolutePath;
-            if (path.StartsWith("/account", StringComparison.OrdinalIgnoreCase))
-            {
-                NavigationManager.NavigateTo(NavigationManager.Uri, forceLoad: true);
-            }
-        }
-    </NotFound>
-</Router>

DeepDrftWeb.Client/_Imports.razor

@@ -10,4 +10,5 @@
 @using MudBlazor
 @using MudBlazor.Services
 @using MudBlazor.ThemeManager
-@using DeepDrftWeb.Client.Common
+@using DeepDrftWeb.Client.Common
+@layout DeepDrftWeb.Client.Layout.MainLayout

DeepDrftWeb/Components/App.razor

@@ -15,11 +15,11 @@
     <link rel="stylesheet" href="styles/deepdrft-styles.css" />
     <ImportMap />
     <link rel="icon" type="image/ico" href="deepdrft-logo.ico" />
-    <HeadOutlet @rendermode="InteractiveAuto" />
+    <HeadOutlet @rendermode="InteractiveServer" />
 </head>
 
 <body>
-<Routes @rendermode="InteractiveAuto" />
+<Routes @rendermode="InteractiveServer" />
 <script src="_framework/blazor.web.js"></script>
 <script src=@Assets["_content/MudBlazor/MudBlazor.min.js"]></script>
 <script type="module">

DeepDrftWeb/Components/Routes.razor

@@ -0,0 +1,21 @@
+<Router AppAssembly="typeof(App).Assembly"
+        AdditionalAssemblies="new[] { typeof(DeepDrftWeb.Client._Imports).Assembly, typeof(DeepDrftCms._Imports).Assembly, typeof(AuthBlocksWeb._Imports).Assembly }">
+    <Found Context="routeData">
+        <AuthorizeRouteView RouteData="routeData" DefaultLayout="typeof(DeepDrftWeb.Client.Layout.MainLayout)">
+            <NotAuthorized>
+                @{
+                    NavigationManager.NavigateTo($"account/login?returnUrl={Uri.EscapeDataString(NavigationManager.Uri)}", forceLoad: true);
+                }
+            </NotAuthorized>
+        </AuthorizeRouteView>
+        <FocusOnNavigate RouteData="routeData" Selector="h1" />
+    </Found>
+    <NotFound>
+        <PageTitle>Not found</PageTitle>
+        <LayoutView Layout="typeof(DeepDrftWeb.Client.Layout.MainLayout)">
+            <p role="alert">Sorry, there's nothing at this address.</p>
+        </LayoutView>
+    </NotFound>
+</Router>
+
+@inject NavigationManager NavigationManager

DeepDrftWeb/Components/_Imports.razor

@@ -1,6 +1,7 @@
 @using System.Net.Http
 @using System.Net.Http.Json
 @using Microsoft.AspNetCore.Components.Forms
+@using Microsoft.AspNetCore.Components.Authorization
 @using Microsoft.AspNetCore.Components.Routing
 @using Microsoft.AspNetCore.Components.Web
 @using static Microsoft.AspNetCore.Components.Web.RenderMode