Use native text Close button for sheet toolbars on macOS

Sheet dismiss buttons rendered as an iOS-style circular glass "X" on
macOS 26, which looks foreign on the desktop. Add a shared
sheetCloseToolbarItem helper that renders a native text "Close" button
on macOS while keeping the compact icon-only xmark on iOS/tvOS, and
replace the ~14 duplicated inline close buttons across sheets with it.

Yattee/Views/Player/ChaptersView.swift

@@ -31,14 +31,7 @@ struct ChaptersView: View {
             .navigationBarTitleDisplayMode(.inline)
             #endif
             .toolbar {
-                ToolbarItem(placement: .confirmationAction) {
-                    Button(role: .cancel) {
-                        dismiss()
-                    } label: {
-                        Label(String(localized: "common.close"), systemImage: "xmark")
-                            .labelStyle(.iconOnly)
-                    }
-                }
+                sheetCloseToolbarItem { dismiss() }
             }
             .task {
                 await preloadChapterSheets()

Yattee/Views/Player/PlayerHelperViews.swift

@@ -114,14 +114,7 @@ struct ErrorDetailsSheet: View {
             #endif
             .toolbar {
                 #if !os(tvOS)
-                ToolbarItem(placement: .confirmationAction) {
-                    Button(role: .cancel) {
-                        dismiss()
-                    } label: {
-                        Label(String(localized: "common.close"), systemImage: "xmark")
-                            .labelStyle(.iconOnly)
-                    }
-                }
+                sheetCloseToolbarItem { dismiss() }
 
                 ToolbarItemGroup(placement: .primaryAction) {
                     // Copy button

Yattee/Views/Player/QualitySelectorView.swift

@@ -276,14 +276,7 @@ struct QualitySelectorView: View {
         #endif
         #if !os(tvOS)
         .toolbar {
-            ToolbarItem(placement: .confirmationAction) {
-                Button(role: .cancel) {
-                    performDismiss()
-                } label: {
-                    Label(String(localized: "common.close"), systemImage: "xmark")
-                        .labelStyle(.iconOnly)
-                }
-            }
+            sheetCloseToolbarItem { performDismiss() }
         }
         #endif
         .navigationDestination(for: QualitySelectorDestination.self) { destination in

Yattee/Views/Player/QueueManagementSheet.swift

@@ -125,14 +125,7 @@ struct QueueManagementSheet: View {
                 ToolbarItem(placement: .cancellationAction) {
                     queueModeMenu
                 }
-                ToolbarItem(placement: .confirmationAction) {
-                    Button(role: .cancel) {
-                        performDismiss()
-                    } label: {
-                        Label(String(localized: "common.close"), systemImage: "xmark")
-                            .labelStyle(.iconOnly)
-                    }
-                }
+                sheetCloseToolbarItem { performDismiss() }
             }
         }
         .presentationDragIndicator(.visible)