Add animation keys, TableView util, and code cleanup

Added new animation key constants for navigation scenarios in AnimationHelper. Improved nullability handling in container lookup. Introduced FindVisualElementFromTableView utility in PlatUtils for locating child elements in TableView rows. Removed unused field and cleaned up code in BaseViewModelWin.

Author: YBTopaz8

Dimmer/Dimmer.WinUI/Utils/AnimationHelper.cs

@@ -13,13 +13,17 @@ public static class AnimationHelper
     // Define your keys here to avoid "Magic Strings"
     public const string Key_ListToDetail = "ForwardConnectedAnimation";
     public const string Key_DetailToList = "BackConnectedAnimation";
+    public const string Key_ToViewQueue = "ViewNowPlayingQueueAnim";
+    public const string Key_NowPlayingPage = "ViewNowPlayingPage";
+    public const string Key_ToViewSingleSongPopUp = "ViewSingleSongPopup";
     public const string Key_ArtistToSong = "ArtistToSongDetailsAnim";
     public const string Key_Forward = "ForwardConnectedAnimation";
     public const string Key_Back = "BackConnectedAnimation";
 
     public const string Key_DetailToEdit = "SwingFromSongDetailToEdit";
     /// <summary>
     /// Prepares the animation BEFORE navigation (Call this on Click)
+    /// Can also be called in OnNavigatedTo so as to prepare the objects before they're loaded
     /// </summary>
     public static void Prepare(string key, UIElement? source, bool isList = false)
     {
@@ -93,7 +97,7 @@ public static async Task TryStartListReturn(ListViewBase listView, object itemTo
 
         // 3. Enter a Retry Loop to find the container
         // We try 10 times with a 20ms delay (total approx 200ms wait max)
-        FrameworkElement container = null;
+        FrameworkElement? container = null;
         int retries = 0;
         const int maxRetries = 10;
 

Dimmer/Dimmer.WinUI/Utils/StaticUtils/PlatUtils.cs

@@ -587,7 +587,13 @@ public static void ShowContextMenu(this Element element)
             FlyoutBase.ShowAttachedFlyout(platformView);
         }
     }
-
+    public static UIElement FindVisualElementFromTableView(TableView table,
+        object concernedElt, string childName)
+    {
+        var row = table.ContainerFromItem(concernedElt) as FrameworkElement;
+        var image = PlatUtils.FindVisualChild<Image>(row, "coverArtImage");
+        return image;
+    }
 
     public static T? FindVisualChild<T>(DependencyObject? parent, string? childName) where T : FrameworkElement
     {

Dimmer/Dimmer.WinUI/ViewModel/BaseViewModelWin.cs

@@ -14,7 +14,6 @@
 namespace Dimmer.WinUI.ViewModel;
 
 public partial class BaseViewModelWin : BaseViewModel, IArtistActions
-
 {
 
     public readonly IMauiWindowManagerService windowManager;
@@ -24,7 +23,7 @@ public partial class BaseViewModelWin : BaseViewModel, IArtistActions
 
     public SessionManagementViewModel SessionMgtVM { get; }
 
-    private readonly IFolderPicker _folderPicker;
+
     public DimmerMultiWindowCoordinator DimmerMultiWindowCoordinator;
 
     public BaseViewModelWin(IDimmerStateService dimmerStateService,
@@ -46,8 +45,6 @@ public BaseViewModelWin(IDimmerStateService dimmerStateService,
         };
 
         windowManager = mauiWindowManagerService;
-        //AddNextEvent += BaseViewModelWin_AddNextEvent;
-        //MainWindowActivated
 
         this.WhenPropertyChange(nameof(base.IsAppScanning), v => (base.IsAppScanning))
             .ObserveOn(RxSchedulers.UI)