feat(cms): Release Archive medium tab strip (ALL · CUTS · SESSIONS · MIXES), retire navigate-away cards

Replace the navigate-away ReleaseArchiveBrowser cards and the redundant top-level Releases
toggle with an in-page MudTabs strip under the Releases mode: ALL (CmsAllReleasesGrid) plus
one enum-driven tab per ReleaseMedium. Sessions/Mixes browsers gain an Embedded flag that
suppresses standalone page chrome when hosted as tab content; CmsCutBrowser is the new
Cut-filtered grid. /tracks/sessions, /tracks/mixes, /tracks/archive stay reachable by URL.

DeepDrftManager/Services/CmsTrackBrowserViewModel.cs

@@ -6,8 +6,10 @@ namespace DeepDrftManager.Services;
 public enum BrowseMode
 {
     Tracks,
+
+    /// <summary>The release view — hosts the medium tab strip (ALL · CUTS · SESSIONS · MIXES, §8.A).</summary>
     Albums,
-    Archive,
+
     Genres,
 }