Add glass background theme setting for macOS control bar

Rename the macOS "Control Bar Buttons" settings entry to "Control Bar"
and add an Auto/Light/Dark glass background picker on that page. The
choice is stored per-preset as GlobalLayoutSettings.controlBarTheme and
forces the bar's glass color scheme via glassBackground(colorScheme:).

Yattee/Localizable.xcstrings

@@ -1859,6 +1859,17 @@
         }
       }
     },
+    "controls.theme.auto" : {
+      "extractionState" : "extracted_with_value",
+      "localizations" : {
+        "en" : {
+          "stringUnit" : {
+            "state" : "new",
+            "value" : "Auto"
+          }
+        }
+      }
+    },
     "controls.theme.dark" : {
       "localizations" : {
         "en" : {
@@ -13315,13 +13326,13 @@
         }
       }
     },
-    "settings.playerControls.controlBarButtons" : {
+    "settings.playerControls.controlBar" : {
       "extractionState" : "extracted_with_value",
       "localizations" : {
         "en" : {
           "stringUnit" : {
             "state" : "new",
-            "value" : "Control Bar Buttons"
+            "value" : "Control Bar"
           }
         }
       }
@@ -13396,6 +13407,17 @@
         }
       }
     },
+    "settings.playerControls.glassBackground" : {
+      "extractionState" : "extracted_with_value",
+      "localizations" : {
+        "en" : {
+          "stringUnit" : {
+            "state" : "new",
+            "value" : "Glass Background"
+          }
+        }
+      }
+    },
     "settings.playerControls.import.error.emptyFile" : {
       "localizations" : {
         "en" : {

Yattee/Models/PlayerControls/GlobalLayoutSettings.swift

@@ -411,6 +411,9 @@ struct GlobalLayoutSettings: Codable, Hashable, Sendable {
     /// How volume is controlled during playback.
     var volumeMode: VolumeMode
 
+    /// Forced appearance for the macOS control bar's glass background.
+    var controlBarTheme: ControlsTheme
+
     /// Theme derived from style (for backwards compatibility).
     var theme: ControlsTheme { style.theme }
 
@@ -433,6 +436,7 @@ struct GlobalLayoutSettings: Codable, Hashable, Sendable {
         case systemControlsMode
         case systemControlsSeekDuration
         case volumeMode
+        case controlBarTheme
     }
 
     init(from decoder: Decoder) throws {
@@ -445,6 +449,7 @@ struct GlobalLayoutSettings: Codable, Hashable, Sendable {
         systemControlsMode = try container.decodeIfPresent(SystemControlsMode.self, forKey: .systemControlsMode) ?? .seek
         systemControlsSeekDuration = try container.decodeIfPresent(SystemControlsSeekDuration.self, forKey: .systemControlsSeekDuration) ?? .tenSeconds
         volumeMode = try container.decodeIfPresent(VolumeMode.self, forKey: .volumeMode) ?? .mpv
+        controlBarTheme = try container.decodeIfPresent(ControlsTheme.self, forKey: .controlBarTheme) ?? .system
     }
 
     func encode(to encoder: Encoder) throws {
@@ -457,6 +462,7 @@ struct GlobalLayoutSettings: Codable, Hashable, Sendable {
         try container.encode(systemControlsMode, forKey: .systemControlsMode)
         try container.encode(systemControlsSeekDuration, forKey: .systemControlsSeekDuration)
         try container.encode(volumeMode, forKey: .volumeMode)
+        try container.encode(controlBarTheme, forKey: .controlBarTheme)
     }
 
     // MARK: - Initialization
@@ -469,7 +475,8 @@ struct GlobalLayoutSettings: Codable, Hashable, Sendable {
         controlsFadeOpacity: Double = 0.5,
         systemControlsMode: SystemControlsMode = .seek,
         systemControlsSeekDuration: SystemControlsSeekDuration = .tenSeconds,
-        volumeMode: VolumeMode = .mpv
+        volumeMode: VolumeMode = .mpv,
+        controlBarTheme: ControlsTheme = .system
     ) {
         self.style = style
         self.buttonSize = buttonSize
@@ -478,6 +485,7 @@ struct GlobalLayoutSettings: Codable, Hashable, Sendable {
         self.systemControlsMode = systemControlsMode
         self.systemControlsSeekDuration = systemControlsSeekDuration
         self.volumeMode = volumeMode
+        self.controlBarTheme = controlBarTheme
     }
 
     // MARK: - Defaults

Yattee/Views/Player/macOS/MacOSControlBar.swift

@@ -80,7 +80,7 @@ struct MacOSControlBar: View {
         .padding(.horizontal, 16)
         .padding(.vertical, 10)
         .frame(maxWidth: 500)
-        .glassBackground(.regular, in: .rect(cornerRadius: 16))
+        .glassBackground(.regular, in: .rect(cornerRadius: 16), colorScheme: globalSettings.controlBarTheme.colorScheme)
         .shadow(color: .black.opacity(0.3), radius: 8, y: 4)
         // Seek preview overlay - positioned above the control bar
         .overlay(alignment: .bottom) {

Yattee/Views/Settings/PlayerControls/PlayerControlsSettingsView.swift

@@ -354,7 +354,7 @@ private struct LayoutSectionsSection: View {
                 HStack {
                     #if os(macOS)
                     Label(
-                        String(localized: "settings.playerControls.controlBarButtons", defaultValue: "Control Bar Buttons"),
+                        String(localized: "settings.playerControls.controlBar", defaultValue: "Control Bar"),
                         systemImage: "rectangle.bottomthird.inset.filled"
                     )
                     #else

Yattee/Views/Settings/PlayerControls/SectionEditorView.swift

@@ -15,6 +15,7 @@ struct SectionEditorView: View {
     // Local state for immediate UI updates
     @State private var buttons: [ControlButtonConfiguration] = []
     @State private var availableTypes: [ControlButtonType] = []
+    @State private var controlBarTheme: ControlsTheme = .system
 
     var body: some View {
         List {
@@ -45,6 +46,29 @@ struct SectionEditorView: View {
             .listRowBackground(Color.clear)
             #endif
 
+            // The macOS bar draws a glass capsule whose appearance can be forced.
+            #if os(macOS)
+            if sectionType == .bottom {
+                Section {
+                    Picker(
+                        String(localized: "settings.playerControls.glassBackground", defaultValue: "Glass Background"),
+                        selection: $controlBarTheme
+                    ) {
+                        ForEach(ControlsTheme.allCases, id: \.self) { theme in
+                            Text(glassBackgroundLabel(for: theme)).tag(theme)
+                        }
+                    }
+                    .disabled(!viewModel.canEditActivePreset)
+                    .onChange(of: controlBarTheme) { _, newTheme in
+                        guard newTheme != viewModel.currentLayout.globalSettings.controlBarTheme else { return }
+                        viewModel.updateGlobalSettingsSync { $0.controlBarTheme = newTheme }
+                    }
+                } header: {
+                    Text(String(localized: "settings.playerControls.appearance"))
+                }
+            }
+            #endif
+
             // Added buttons
             Section {
                 ForEach(buttons) { button in
@@ -139,6 +163,7 @@ struct SectionEditorView: View {
         case .bottom:
             buttons = preset.layout.bottomSection.buttons
         }
+        controlBarTheme = preset.layout.globalSettings.controlBarTheme
         syncAvailableTypes()
     }
 
@@ -160,12 +185,27 @@ struct SectionEditorView: View {
         viewModel.addButtonSync(buttonType, to: sectionType)
     }
 
+    #if os(macOS)
+    private func glassBackgroundLabel(for theme: ControlsTheme) -> String {
+        switch theme {
+        case .system:
+            return String(localized: "controls.theme.auto", defaultValue: "Auto")
+        case .light, .dark:
+            return theme.displayName
+        }
+    }
+    #endif
+
     private var sectionTitle: String {
         switch sectionType {
         case .top:
             return String(localized: "settings.playerControls.topButtons")
         case .bottom:
+            #if os(macOS)
+            return String(localized: "settings.playerControls.controlBar", defaultValue: "Control Bar")
+            #else
             return String(localized: "settings.playerControls.bottomButtons")
+            #endif
         }
     }
 }