ui(macos): lower onboarding welcome content

apps/macos/Sources/Clawdis/Onboarding.swift

@@ -132,6 +132,7 @@ struct OnboardingView: View {
 
     private func welcomePage() -> some View {
         self.onboardingPage {
+            VStack(spacing: 22) {
                 Text("Welcome to Clawdis")
                     .font(.largeTitle.weight(.semibold))
                 Text(
@@ -173,6 +174,8 @@ struct OnboardingView: View {
                 }
                 .frame(maxWidth: 520)
             }
+            .padding(.top, 16)
+        }
     }
 
     private func connectionPage() -> some View {