Add Show Sidebar toggle to Subscriptions view options

Adds a Show Sidebar toggle (iPad regular and macOS) that controls
channels sidebar visibility. When the sidebar is shown, the channel
strip picker is disabled and the redundant channel header link above
the feed is hidden. Layout picker now uses inline menu style for
consistency with other options.

Yattee/Localizable.xcstrings

@@ -17720,6 +17720,16 @@
         }
       }
     },
+    "viewOptions.showSidebar" : {
+      "localizations" : {
+        "en" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "Show Sidebar"
+          }
+        }
+      }
+    },
     "viewOptions.layout" : {
       "localizations" : {
         "en" : {

Yattee/Views/Subscriptions/SubscriptionsView.swift

@@ -30,6 +30,7 @@ struct SubscriptionsView: View {
     @AppStorage("subscriptionsGridColumns") private var gridColumns = 2
     @AppStorage("subscriptionsHideWatched") private var hideWatched = false
     @AppStorage("subscriptionsChannelStripSize") private var channelStripSize: ChannelStripSize = .normal
+    @AppStorage("subscriptionsShowSidebar") private var showSidebar = true
 
     /// List style from centralized settings.
     private var listStyle: VideoListStyle {
@@ -226,7 +227,7 @@ struct SubscriptionsView: View {
                     .padding(.top, 20)
                     #elseif os(macOS)
                     HSplitView {
-                        if subscriptionsLoaded && subscriptions.count > 1 {
+                        if showSidebar && subscriptionsLoaded && subscriptions.count > 1 {
                             macOSChannelsSidebar
                                 .frame(minWidth: 180, idealWidth: 240, maxWidth: 400)
                         }
@@ -242,7 +243,7 @@ struct SubscriptionsView: View {
                         .frame(minWidth: 300, maxWidth: .infinity, maxHeight: .infinity)
                     }
                     #else
-                    if isIPadRegular && subscriptionsLoaded && subscriptions.count > 1 {
+                    if isIPadRegular && showSidebar && subscriptionsLoaded && subscriptions.count > 1 {
                         HStack(spacing: 0) {
                             iOSChannelsSidebar
                                 .frame(width: 260)
@@ -276,7 +277,7 @@ struct SubscriptionsView: View {
                     VStack {
                         Spacer()
 
-                        if subscriptionsLoaded && subscriptions.count > 1 && channelStripSize != .disabled && !isShowingFullScreenError && !isIPadRegular {
+                        if subscriptionsLoaded && subscriptions.count > 1 && channelStripSize != .disabled && !isShowingFullScreenError && !(isIPadRegular && showSidebar) {
                             bottomFloatingFilterStrip
                                 .transition(.move(edge: .bottom).combined(with: .opacity))
                         }
@@ -305,18 +306,21 @@ struct SubscriptionsView: View {
                         NavigationStack {
                             Form {
                                 Section {
-                                    // Layout picker (segmented)
+                                    // Layout picker (inline menu)
-                                    Picker(selection: $layout) {
+                                    PlatformMenuPicker(String(localized: "viewOptions.layout"), selection: $layout) {
                                         ForEach(VideoListLayout.allCases, id: \.self) { option in
                                             Label(option.displayName, systemImage: option.systemImage)
                                                 .tag(option)
                                         }
-                                    } label: {
-                                        Text("viewOptions.layout")
                                     }
-                                    .pickerStyle(.segmented)
+
-                                    .listRowBackground(Color.clear)
+                                    #if os(macOS)
-                                    .listRowInsets(EdgeInsets(top: 8, leading: 0, bottom: 8, trailing: 0))
+                                    Toggle("viewOptions.showSidebar", isOn: $showSidebar)
+                                    #elseif os(iOS)
+                                    if isIPadRegular {
+                                        Toggle("viewOptions.showSidebar", isOn: $showSidebar)
+                                    }
+                                    #endif
 
                                     // List-specific options
                                     if layout == .list {
@@ -353,6 +357,7 @@ struct SubscriptionsView: View {
                                             Text(size.displayName).tag(size)
                                         }
                                     }
+                                    .disabled(isIPadRegular && showSidebar)
                                     #endif
                                 }
 
@@ -832,6 +837,16 @@ struct SubscriptionsView: View {
     }
     #endif
 
+    private var isSidebarVisible: Bool {
+        #if os(macOS)
+        return showSidebar && subscriptionsLoaded && subscriptions.count > 1
+        #elseif os(iOS)
+        return isIPadRegular && showSidebar && subscriptionsLoaded && subscriptions.count > 1
+        #else
+        return false
+        #endif
+    }
+
     #if os(iOS)
     private var isIPadRegular: Bool {
         UIDevice.current.userInterfaceIdiom == .pad && horizontalSizeClass == .regular
@@ -1005,6 +1020,8 @@ struct SubscriptionsView: View {
             Text("subscriptions.updatingChannels \(progress.loaded) \(progress.total)")
                 .monospacedDigit()
                 .foregroundStyle(.secondary)
+        } else if isSidebarVisible {
+            EmptyView()
         } else if let subscription = selectedSubscription {
             Button {
                 appEnvironment?.navigationCoordinator.navigate(