Phase 9 Wave 4: ARCHIVE nav + Cuts/Sessions/Mixes pages + MixWaveformVisualizer

Replaces flat RELEASES/SESSIONS/MIXES nav with ARCHIVE dropdown (PageRoute.Children,
one-level cap, dual-role node). Adds /archive overview, /cuts (AlbumsView + medium
filter; /albums redirects), /sessions + /sessions/{id} (hero-dominant), /mixes +
/mixes/{id} (MixWaveformVisualizer full-page background). Extracts ReleaseDetailScaffold
from TrackDetail (invariant trio). PersistentComponentState bridge on all new pages.
Click-to-seek seam designed on MixWaveformVisualizer (inert until wired).

DeepDrftPublic.Client/Pages/TrackDetail.razor.cs

@@ -1,5 +1,4 @@
 using DeepDrftModels.DTOs;
-using DeepDrftPublic.Client.Services;
 using DeepDrftPublic.Client.ViewModels;
 using Microsoft.AspNetCore.Components;
 
@@ -12,9 +11,7 @@ public partial class TrackDetail : ComponentBase, IDisposable
     [Parameter] public required string EntryKey { get; set; }
     [Inject] public required TrackDetailViewModel ViewModel { get; set; }
     [Inject] public required PersistentComponentState PersistentState { get; set; }
-    [CascadingParameter] public required IStreamingPlayerService PlayerService { get; set; }
 
-    private IStreamingPlayerService? _subscribedService;
     private PersistingComponentStateSubscription _persistingSubscription;
 
     protected override async Task OnInitializedAsync()
@@ -36,24 +33,6 @@ public partial class TrackDetail : ComponentBase, IDisposable
         }
     }
 
-    protected override void OnParametersSet()
-    {
-        // The play button's icon reads off the player's live state (CurrentTrack /
-        // IsPlaying / IsPaused), which mutates outside this component's render path.
-        // The cascade is IsFixed, so the provider's re-render never reaches us —
-        // subscribe to the multicast side-channel and re-render on every state change.
-        if (PlayerService != null && !ReferenceEquals(PlayerService, _subscribedService))
-        {
-            if (_subscribedService != null)
-                _subscribedService.StateChanged -= OnPlayerStateChanged;
-
-            PlayerService.StateChanged += OnPlayerStateChanged;
-            _subscribedService = PlayerService;
-        }
-    }
-
-    private void OnPlayerStateChanged() => InvokeAsync(StateHasChanged);
-
     private Task PersistTrack()
     {
         if (ViewModel.Track is not null)
@@ -63,33 +42,5 @@ public partial class TrackDetail : ComponentBase, IDisposable
         return Task.CompletedTask;
     }
 
-    private async Task PlayTrack()
-    {
-        if (ViewModel.Track is null) return;
-
-        var isThisTrack = PlayerService.CurrentTrack?.Id == ViewModel.Track.Id;
-
-        // Toggle play/pause if this track is already the active one (playing or paused);
-        // otherwise start a fresh stream. SelectTrackStreaming is the live entry point —
-        // the buffered SelectTrack path is dead.
-        if (isThisTrack && (PlayerService.IsPlaying || PlayerService.IsPaused))
-        {
-            await PlayerService.TogglePlayPause();
-        }
-        else
-        {
-            await PlayerService.SelectTrackStreaming(ViewModel.Track);
-        }
-    }
-
-    public void Dispose()
-    {
-        _persistingSubscription.Dispose();
-
-        if (_subscribedService != null)
-        {
-            _subscribedService.StateChanged -= OnPlayerStateChanged;
-            _subscribedService = null;
-        }
-    }
+    public void Dispose() => _persistingSubscription.Dispose();
 }