Use unique samples for Dialog, NowPlaying, SettingsPanel and WaveOverlay pop-in/pop-out

osu.Game/Overlays/DialogOverlay.cs

@@ -14,6 +14,9 @@ namespace osu.Game.Overlays
     {
         private readonly Container dialogContainer;
 
+        protected override string PopInSampleName => "UI/dialog-pop-in";
+        protected override string PopOutSampleName => "UI/dialog-pop-out";
+
         public PopupDialog CurrentDialog { get; private set; }
 
         public DialogOverlay()

osu.Game/Overlays/NowPlayingOverlay.cs

@@ -51,6 +51,9 @@ namespace osu.Game.Overlays
         private Container dragContainer;
         private Container playerContainer;
 
+        protected override string PopInSampleName => "UI/now-playing-pop-in";
+        protected override string PopOutSampleName => "UI/now-playing-pop-out";
+
         /// <summary>
         /// Provide a source for the toolbar height.
         /// </summary>

osu.Game/Overlays/SettingsPanel.cs

@@ -40,6 +40,8 @@ namespace osu.Game.Overlays
 
         private SeekLimitedSearchTextBox searchTextBox;
 
+        protected override string PopInSampleName => "UI/settings-pop-in";
+
         /// <summary>
         /// Provide a source for the toolbar height.
         /// </summary>

osu.Game/Overlays/WaveOverlayContainer.cs

@@ -18,6 +18,8 @@ namespace osu.Game.Overlays
 
         protected override bool StartHidden => true;
 
+        protected override string PopInSampleName => "UI/wave-pop-in";
+
         protected WaveOverlayContainer()
         {
             AddInternal(Waves = new WaveContainer