Show queue count badge on macOS queue button

Add a queue-count badge to the macOS player controls queue button
(MacOSControlsSectionRenderer) and the shared mini player queue button
(MiniPlayerView), matching the iOS pill button behavior.

Yattee/Views/Player/MiniPlayerView.swift

@@ -519,10 +519,25 @@ struct MiniPlayerView: View {
             incrementTapCount(for: config)
             navigationCoordinator?.isMiniPlayerQueueSheetPresented = true
         } label: {
-            Image(systemName: "list.bullet")
-                .font(isTabAccessory ? .title3 : .title2)
-                .frame(width: 32, height: 32)
-                .contentShape(Rectangle())
+            ZStack(alignment: .bottom) {
+                Image(systemName: "list.bullet")
+                    .font(isTabAccessory ? .title3 : .title2)
+                    .frame(width: 32, height: 32)
+
+                // Badge showing queue count
+                let queueCount = playerState?.queue.count ?? 0
+                if queueCount > 0 {
+                    Text("\(queueCount)")
+                        .font(.system(size: 9, weight: .bold))
+                        .foregroundStyle(.white)
+                        .padding(.horizontal, 4)
+                        .padding(.vertical, 1)
+                        .background(Color.accentColor, in: Capsule())
+                        .offset(y: 4)
+                        .allowsHitTesting(false)
+                }
+            }
+            .contentShape(Rectangle())
         }
         .buttonStyle(.plain)
     }

Yattee/Views/Player/macOS/MacOSControlsSectionRenderer.swift

@@ -211,6 +211,9 @@ struct MacOSControlsSectionRenderer: View {
                 controlButton(systemImage: "list.bullet", help: config.buttonType.displayName) {
                     actions.onShowQueue?()
                 }
+                .overlay(alignment: .bottom) {
+                    queueBadge
+                }
                 .disabled(isLocked)
                 .opacity(isLocked ? 0.5 : 1.0)
             }
@@ -289,6 +292,23 @@ struct MacOSControlsSectionRenderer: View {
         MacOSRendererButtonStyle(context: context)
     }
 
+    /// Badge showing the number of items currently in the queue, mirroring the
+    /// iOS pill queue button. Hidden when the queue is empty.
+    @ViewBuilder
+    private var queueBadge: some View {
+        let count = actions.playerState.queue.count
+        if count > 0 {
+            Text("\(count)")
+                .font(.system(size: context == .bar ? 8 : 9, weight: .bold))
+                .foregroundStyle(.white)
+                .padding(.horizontal, 4)
+                .padding(.vertical, 1)
+                .background(Color.accentColor, in: Capsule())
+                .offset(y: 4)
+                .allowsHitTesting(false)
+        }
+    }
+
     @ViewBuilder
     private func controlButton(
         systemImage: String,