1. Makefile: Added codesign --force --sign - to ad-hoc sign the app bundle —

  SMAppService.mainApp.register() requires a signed app to work
  2. SettingsView: Added error message display so if registration still fails (e.g., app not in
  /Applications), the user sees why instead of the toggle silently reverting

Author: kacigaya

Makefile

@@ -26,6 +26,7 @@ app: build
 	/usr/libexec/PlistBuddy -c "Add :LSUIElement bool true" "$(APP_BUNDLE)/Contents/Info.plist" 2>/dev/null || true
 	/usr/libexec/PlistBuddy -c "Add :CFBundleIconFile string '$(APP_NAME)'" "$(APP_BUNDLE)/Contents/Info.plist" 2>/dev/null || true
 	/usr/libexec/PlistBuddy -c "Set :CFBundleIconFile '$(APP_NAME)'" "$(APP_BUNDLE)/Contents/Info.plist"
+	codesign --force --sign - "$(APP_BUNDLE)"
 
 dmg: app
 	rm -f $(DMG_NAME)

Sources/DNSSwitcher/UI/SettingsView.swift

@@ -7,6 +7,7 @@ struct SettingsView: View {
     @State private var editingProfile: DnsProfile?
     @State private var showingEditor = false
     @State private var launchAtLogin = SMAppService.mainApp.status == .enabled
+    @State private var loginItemError: String?
 
     var body: some View {
         VStack(spacing: 0) {
@@ -70,10 +71,18 @@ struct SettingsView: View {
                             } else {
                                 try SMAppService.mainApp.unregister()
                             }
+                            loginItemError = nil
                         } catch {
                             launchAtLogin = !newValue
+                            loginItemError = error.localizedDescription
                         }
                     }
+
+                if let loginItemError {
+                    Text(loginItemError)
+                        .font(.caption)
+                        .foregroundColor(.red)
+                }
             }
             .padding()
         }