Subscribed channels list in tab navigation

Shared/Subscriptions/SubscriptionsPageButton.swift

@@ -0,0 +1,22 @@
+import Defaults
+import SwiftUI
+
+struct SubscriptionsPageButton: View {
+    @Default(.subscriptionsViewPage) private var subscriptionsViewPage
+
+    var body: some View {
+        Button {
+            subscriptionsViewPage = subscriptionsViewPage.next()
+        } label: {
+            Text(subscriptionsViewPage.rawValue.capitalized)
+                .frame(maxWidth: .infinity)
+                .font(.caption2)
+        }
+    }
+}
+
+struct SubscriptionsPageButton_Previews: PreviewProvider {
+    static var previews: some View {
+        SubscriptionsPageButton()
+    }
+}