Disable settings in sidebar on macOS

Yattee/Models/Navigation/SidebarMainItem.swift

@@ -124,6 +124,12 @@ enum SidebarMainItem: String, CaseIterable, Codable, Identifiable, Sendable {
             #else
             return true
             #endif
+        case .settings:
+            #if os(macOS)
+            return false
+            #else
+            return true
+            #endif
         default:
             return true
         }