Tighten Sidebar settings for macOS

Drop the redundant inner NavigationStack on non-tvOS (the outer detail
pane already provides one) and apply .listStyle(.inset) on macOS. Kept
as List to preserve drag-to-reorder for the main navigation section.

Yattee/Views/Settings/SidebarSettingsView.swift

@@ -125,7 +125,16 @@ struct SidebarSettingsView: View {
     }
 
     var body: some View {
+        #if os(tvOS)
         NavigationStack {
+            sidebarList
+        }
+        #else
+        sidebarList
+        #endif
+    }
+
+    private var sidebarList: some View {
         List {
             startupSection
             mainNavigationSection
@@ -136,6 +145,9 @@ struct SidebarSettingsView: View {
         #if os(iOS)
         .environment(\.editMode, .constant(.active))
         #endif
+        #if os(macOS)
+        .listStyle(.inset)
+        #endif
         #if !os(tvOS)
         .navigationTitle(String(localized: "settings.sidebar.title"))
         #endif
@@ -146,10 +158,6 @@ struct SidebarSettingsView: View {
             loadMainNavigationSettings()
         }
     }
-        #if os(macOS)
-        .frame(minWidth: 400, minHeight: 300)
-        #endif
-    }
 
     // MARK: - Startup Section