style(ui): update integration step counter visibility and add up-to-date status icon

Sources/Firelink/Settings/AboutSettingsPane.swift

@@ -148,6 +148,9 @@ struct AboutSettingsPane: View {
                 .buttonStyle(.borderedProminent)
 
             case .upToDate(let latestVersion, _):
+                Image(systemName: "checkmark.seal.fill")
+                    .font(.title2)
+                    .foregroundStyle(.green)
                 VStack(alignment: .leading, spacing: 2) {
                     Text("Firelink is up to date")
                         .font(.headline)

Sources/Firelink/Settings/IntegrationSettingsPane.swift

@@ -138,9 +138,8 @@ struct CompactStepCardView: View {
                 // Step Number Badge
                 ZStack {
                     Circle()
-                        .fill(Color(nsColor: .controlBackgroundColor))
+                        .fill(Color.secondary.opacity(0.1))
                         .frame(width: 24, height: 24)
-                        .shadow(color: .black.opacity(0.1), radius: 1, y: 1)
                     
                     Text("\(stepNumber)")
                         .font(.system(.caption, design: .rounded).weight(.bold))