fix(ios): generate light app store screenshots only

apps/ios/UITests/OpenClawSnapshotUITests.swift

@@ -3,11 +3,6 @@ import XCTest
 
 @MainActor
 final class OpenClawSnapshotUITests: XCTestCase {
-    private enum ScreenshotAppearance: String, CaseIterable {
-        case light
-        case dark
-    }
-
     private struct ScreenshotTarget {
         let initialTab: String
         let initialDestination: String
@@ -36,12 +31,9 @@ final class OpenClawSnapshotUITests: XCTestCase {
     }
 
     func testConnectedGatewayTabs() {
-        for appearance in ScreenshotAppearance.allCases {
-            for target in Self.screenshotTargets {
-                self.launchApp(for: target, appearance: appearance)
-                let name = appearance == .light ? target.name : "\(target.name)-dark"
-                snapshot(name, timeWaitingForIdle: 5)
-            }
+        for target in Self.screenshotTargets {
+            self.launchApp(for: target)
+            snapshot(target.name, timeWaitingForIdle: 5)
         }
     }
 
@@ -183,18 +175,13 @@ final class OpenClawSnapshotUITests: XCTestCase {
         XCTAssertEqual(app.state, .runningForeground)
     }
 
-    private func launchApp(
-        for target: ScreenshotTarget,
-        appearance: ScreenshotAppearance = .light)
-    {
+    private func launchApp(for target: ScreenshotTarget) {
         self.app?.terminate()
 
         let app = XCUIApplication()
         setupSnapshot(app)
         app.launchArguments += [
             "--openclaw-screenshot-mode",
-            "--openclaw-appearance",
-            appearance.rawValue,
             "--openclaw-initial-tab",
             target.initialTab,
             "--openclaw-initial-destination",