refactor(split): extract DeepDrftShared.Client RCL with shared atoms

TrackCard, TracksGallery, DDIcons, DeepDrftPalettes (Default+Cms), DeepDrftFontLinks,
and palette CSS tokens extracted. Both hosts and DeepDrftCms reference the shared RCL.

DeepDrftCms/DeepDrftCms.csproj

@@ -22,6 +22,7 @@
   <ItemGroup>
     <ProjectReference Include="..\DeepDrftModels\DeepDrftModels.csproj" />
     <ProjectReference Include="..\DeepDrftData\DeepDrftData.csproj" />
+    <ProjectReference Include="..\DeepDrftShared.Client\DeepDrftShared.Client.csproj" />
   </ItemGroup>
 
 </Project>

DeepDrftCms/Layout/CmsLayout.razor

@@ -1,7 +1,8 @@
 @rendermode InteractiveServer
 @inherits LayoutComponentBase
+@using DeepDrftShared.Client.Common
 
-<MudThemeProvider IsDarkMode="false" Theme="@_theme" />
+<MudThemeProvider IsDarkMode="false" Theme="@DeepDrftPalettes.Cms" />
 <MudPopoverProvider />
 <MudDialogProvider />
 <MudSnackbarProvider />
@@ -31,40 +32,3 @@
     <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" } },
-        }
-    };
-}