Use NavigationSplitView on macOS with persistent sidebar Settings button

Replaces the macOS TabView(.sidebarAdaptable) root with NavigationSplitView
so the Settings gear can live in the sidebar column's toolbar (next to the
sidebar toggle) instead of only appearing in HomeView's detail toolbar.

Yattee/Views/Home/HomeView.swift

@@ -10,7 +10,9 @@ import SwiftUI
 struct HomeView: View {
     @Environment(\.appEnvironment) private var appEnvironment
     @Environment(\.scenePhase) private var scenePhase
+    #if !os(tvOS) && !os(macOS)
     @Namespace private var sheetTransition
+    #endif
     @State private var playlists: [LocalPlaylist] = []
     @State private var bookmarksCount: Int = 0
     @State private var recentBookmarks: [Bookmark] = []
@@ -18,7 +20,9 @@ struct HomeView: View {
     @State private var recentContinueWatching: [WatchEntry] = []
     @State private var historyCount: Int = 0
     @State private var recentHistory: [WatchEntry] = []
+    #if !os(tvOS) && !os(macOS)
     @State private var showingSettings = false
+    #endif
     @State private var showingOpenLink = false
     @State private var showingRemoteControl = false
     @State private var showingCustomizeHome = false
@@ -78,7 +82,7 @@ struct HomeView: View {
         .toolbarTitleDisplayMode(.inlineLarge)
         #endif
         .toolbar {
-            #if !os(tvOS)
+            #if !os(tvOS) && !os(macOS)
             ToolbarItem(placement: .primaryAction) {
                 Button {
                     showingSettings = true
@@ -91,7 +95,7 @@ struct HomeView: View {
             }
             #endif
         }
-        #if !os(tvOS)
+        #if !os(tvOS) && !os(macOS)
         .sheet(isPresented: $showingSettings) {
             SettingsView()
                 .liquidGlassSheetContent(sourceID: "homeSettings", in: sheetTransition)