Redesign macOS now-playing bar as centered Liquid Glass capsule

- Replace the full-width material overlay bar with a compact, centered
  capsule (Apple Music style) via a macOS-specific macOSCapsuleLayout
- Extend glassBackground() to use real Liquid Glass on macOS 26 with a
  material fallback on macOS 15-25 (mirrors the PlayerOverlayButton pattern)
- Remove the duplicate close button (close now comes only from the
  configurable button set)
- Keep the capsule visible in the main window while the separate player
  window is open (window mode), still hidden in sheet mode

Yattee/ContentView.swift

@@ -119,14 +119,17 @@ struct ContentView: View {
         let playerState = appEnvironment.playerService.state
         let hasActiveVideo = playerState.currentVideo != nil
         let isExpanded = appEnvironment.navigationCoordinator.isPlayerExpanded
+        // The expanded player is a separate window in window mode, so keep the capsule
+        // visible alongside it. In sheet mode the sheet covers the window, so hide it.
+        let usesWindow = appEnvironment.settingsManager.macPlayerMode.usesWindow
 
-        if hasActiveVideo && !isExpanded {
+        if hasActiveVideo && (!isExpanded || usesWindow) {
             VStack(spacing: 0) {
                 Spacer()
                 MiniPlayerView()
             }
-            // Add padding for tab bar
-            .padding(.bottom, 49)
+            // Float the capsule above the bottom edge (macOS uses a sidebar, not a tab bar)
+            .padding(.bottom, 16)
             // Use move-only transition (no opacity) to prevent thumbnail flash during collapse
             .transition(.move(edge: .bottom))
             .animation(.spring(response: 0.3), value: hasActiveVideo)

Yattee/Views/Components/GlassBackground.swift

@@ -64,23 +64,23 @@ struct GlassBackgroundModifier: ViewModifier {
     }
 
     func body(content: Content) -> some View {
-        #if os(iOS)
-        if #available(iOS 26.0, *) {
+        #if os(iOS) || os(macOS)
+        if #available(iOS 26.0, macOS 26.0, *) {
             content.modifier(LiquidGlassModifier(style: style, shape: shape, colorScheme: colorScheme))
         } else {
             content.modifier(FallbackGlassModifier(shape: shape, material: fallbackMaterial, colorScheme: colorScheme))
         }
         #else
-        // macOS / tvOS don't have glassEffect, always use fallback material
+        // tvOS doesn't have glassEffect, always use fallback material
         content.modifier(FallbackGlassModifier(shape: shape, material: fallbackMaterial, colorScheme: colorScheme))
         #endif
     }
 }
 
-// MARK: - iOS 26+ Liquid Glass
+// MARK: - iOS 26+ / macOS 26+ Liquid Glass
 
-#if os(iOS)
-@available(iOS 26.0, *)
+#if os(iOS) || os(macOS)
+@available(iOS 26.0, macOS 26.0, *)
 private struct LiquidGlassModifier: ViewModifier {
     let style: GlassStyle
     let shape: GlassShape

Yattee/Views/Player/MiniPlayerView.swift

@@ -115,11 +115,15 @@ struct MiniPlayerView: View {
 
     var body: some View {
         Group {
+            #if os(macOS)
+            macOSCapsuleLayout
+            #else
             if isTabAccessory {
                 accessoryLayout
             } else {
                 overlayLayout
             }
+            #endif
         }
         .accessibilityIdentifier("player.miniPlayer")
         .accessibilityLabel("player.miniPlayer")
@@ -254,6 +258,64 @@ struct MiniPlayerView: View {
         }
     }
 
+    // MARK: - macOS Capsule Layout
+
+    #if os(macOS)
+    /// Compact, centered capsule shown in the main window on macOS (Music.app style).
+    /// The expanded player lives in a separate window, so this stays visible alongside it.
+    private var macOSCapsuleLayout: some View {
+        HStack(spacing: 10) {
+            // Video preview - tap for PiP (or expand if PiP unavailable)
+            videoPreviewView
+                .frame(width: 44, height: 26)
+                .clipShape(RoundedRectangle(cornerRadius: 4))
+                .contentShape(Rectangle())
+                .onTapGesture {
+                    handleVideoPreviewTap()
+                }
+
+            // Title/author area - tap to expand player (restores from PiP first if needed)
+            VStack(alignment: .leading, spacing: 1) {
+                MarqueeText(
+                    text: displayTitle,
+                    font: .subheadline,
+                    fontWeight: .medium,
+                    foregroundStyle: .primary
+                )
+
+                if let authorName = currentVideo?.author.name, !authorName.isEmpty {
+                    MarqueeText(
+                        text: authorName,
+                        font: .caption,
+                        foregroundStyle: .secondary
+                    )
+                }
+            }
+            .contentShape(Rectangle())
+            .onTapGesture {
+                expandPlayerWithPiPRestore()
+            }
+
+            // Dynamic buttons from settings (includes close by default - no separate close button)
+            buttonsView
+        }
+        .padding(.horizontal, 12)
+        .padding(.vertical, 6)
+        .frame(maxWidth: 420)
+        .glassBackground(.regular, in: .capsule, fallback: .regularMaterial)
+        .overlay(alignment: .bottom) {
+            GeometryReader { geo in
+                Rectangle()
+                    .fill(.red)
+                    .frame(width: geo.size.width * (playerState?.progress ?? 0), height: 2)
+            }
+            .frame(height: 2)
+        }
+        .clipShape(Capsule())
+        .shadow(color: .black.opacity(0.25), radius: 8, y: 4)
+    }
+    #endif
+
     // MARK: - Shared Components
 
     /// Video preview that shows live video when available, or thumbnail as fallback.