fix(ios): prevent PagerView crash on duplicate states in queue

[huhuanming]

Summary

• 修复 iOS 上 PagerView 快速切换 tab 时因 Duplicate states in queue 导致的致命崩溃
• 在 setPagerViewControllers 方法中增加 transitioning 状态守卫，防止在上一次动画过渡未完成时重复调用 setViewControllers
• 清理 patch 文件中误包含的 android/build/ 构建产物

Root Cause

UIPageViewController 内部的 _UIQueuingScrollView 不支持并发的入队过渡。当用户快速切换 tab 或程序化页面同步与用户操作重叠时，两次 setViewControllers:direction:animated:completion: 调用会导致队列中出现重复状态，触发 NSInternalInconsistencyException 断言崩溃。

现有 patch 已有 recycling、nil、边界检查等守卫，但缺少对 transitioning 状态的检查。

Fix

if (transitioning && animated) {
    NSLog(@"[PagerView] setPagerViewControllers blocked: already transitioning");
    [self enableSwipe];
    return;
}

Test plan

• iOS 上快速连续点击 Earn 区域的 Assets/Portfolio/FAQs tab，确认不崩溃
• 从其他页面导航回 TabDiscovery 后立即点击 tab，确认不崩溃
• 正常 tab 切换功能不受影响
• Android 行为无变化

Sentry Event: 6f5ce7dc764d49189bed67414df232e4

🤖 Generated with Claude Code

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[revan-zhang]

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[devin-ai-integration]

✅ Devin Review: No Issues Found

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