本次更新重点：更快、更安全、更稳定

🔐 安全
• 自定义 API Key 现已加密存储（AES-GCM），旧数据自动无缝迁移，密钥仅存于您的浏览器本地

⚡ 性能
• 翻译并发调度全面升级（滑动窗口），长页面翻译速度提升约 3 倍，内置引擎与自定义 API 均已提速

🛡 稳定性
• 偶发限流自动退避重试，翻译不再因此中断报错
• 关闭或刷新页面时立即停止后台翻译任务，不再浪费额度
• 模型偶发输出的异常数据不再导致整页翻译失败

🐛 修复
• 编辑自定义 API 时密钥显示异常的问题
• 清理了调试日志中可能包含页面文本片段的输出

Version 3.0.1

• Faster first translation — Text within your viewport is translated first, and the first batch is smaller, so results appear much sooner.
• Progressive display — Translations stream onto the page as they generate, instead of appearing all at once.
• Faster AI translation — built-in thinking mode is now disabled by default; translations no longer wait behind a long reasoning phase.
• Custom API improvements — Requests are tuned for translation (temperature 0, higher token cap with automatic fallback), and batches are split across up to 3 parallel streams to cut wall-clock time.
• More reliable streaming — Real API error messages are now shown instead of generic failures; retries with backoff on 429/5xx and a 120s timeout prevent hung requests.
• Smarter output — Refusal-style responses are detected and degraded to the source text, never shown as a translation.
• Fixed locales — Arabic, Indonesian, and Vietnamese translations repaired.