Hera Zhao
26a47aaf23
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navigator.share 在部分手机浏览器不可用时，改为弹出全屏图片
让用户长按保存到相册。三层 fallback:
1. navigator.share({files}) → 系统分享面板
2. 图片弹窗 → 长按保存（手机通用）
3. 下载链接（桌面）
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>