Consolidate CMS /tracks into standalone /releases page

Retire the Tracks list view; promote the Releases view to /releases with
medium tabs (ALL/CUTS/SESSIONS/MIXES). Migrate bulk profile/high-res
backfill and per-track waveform columns into the releases grids. Point
catalogue cards at the three mediums. Remove dead BrowseMode/ViewModel.

DeepDrftManager/Components/Pages/Tracks/BatchUpload.razor

@@ -11,7 +11,6 @@
 @inject NavigationManager Navigation
 @inject ISnackbar Snackbar
 @inject ILogger<BatchUpload> Logger
-@inject CmsTrackBrowserViewModel VM
 
 <PageTitle>Upload Release — DeepDrft CMS</PageTitle>
 
@@ -87,7 +86,7 @@
 
     <MudStack Row="true" Justify="Justify.FlexEnd" Spacing="2" Class="mt-4">
         <MudButton Variant="Variant.Text"
-                   OnClick="@(() => Navigation.NavigateTo("/tracks"))"
+                   OnClick="@(() => Navigation.NavigateTo("/releases"))"
                    Disabled="_uploading">
             Cancel
         </MudButton>
@@ -484,8 +483,7 @@
             if (failed == 0)
             {
                 Snackbar.Add($"Uploaded {succeeded} track(s).", Severity.Success);
-                VM.Invalidate();
-                Navigation.NavigateTo("/tracks");
+                Navigation.NavigateTo("/releases");
             }
             else
             {