Use only tab navigation on iPhone

Shared/Constants.swift

@@ -5,6 +5,14 @@ import SwiftUI
 struct Constants {
     static let yatteeProtocol = "yattee://"
     static let overlayAnimation = Animation.linear(duration: 0.2)
+    static var isIPhone: Bool {
+        #if os(iOS)
+            UIDevice.current.userInterfaceIdiom == .phone
+        #else
+            false
+        #endif
+    }
+
     static var progressViewScale: Double {
         #if os(macOS)
             0.4

Shared/Navigation/ContentView.swift

@@ -25,10 +25,14 @@ struct ContentView: View {
     var body: some View {
         Group {
             #if os(iOS)
-                if horizontalSizeClass == .compact {
+                if Constants.isIPhone {
                     AppTabNavigation()
                 } else {
-                    AppSidebarNavigation()
+                    if horizontalSizeClass == .compact {
+                        AppTabNavigation()
+                    } else {
+                        AppSidebarNavigation()
+                    }
                 }
             #elseif os(macOS)
                 AppSidebarNavigation()