修复四个听写收尾环节的偶发问题，减少卡住和文字不完整的情况。

🐛 Bug 修复

修复关闭「自动粘贴」时，开启文字整理或翻译的听写会一直卡在「处理中」的问题：文字实际已处理完，但结果不复制到剪贴板、不保存到历史，只能重新开始。现在按设置正常收尾。
修复识别服务在录音初期直接报错后，应用一直停在错误状态、无法再次开始听写的问题。现在错误提示展示结束后会正常回到待命状态。
修复文字整理过程中网络流被截断或报错时，把只生成了一半的文字当作最终结果的问题。现在检测到中断会回退为完整的原始转写，不会丢内容。
修复文字处理超过 8 秒上限后仍在干等的问题。超时或按 Escape 取消现在都会立即生效并照常收尾。

v2.1.4: More reliable dictation wrap-up

Fixes four occasional issues in the dictation finish path, reducing stuck sessions and incomplete text.

Fixed a freeze at "processing" when auto-paste was off and text cleanup or translation was enabled: the text was actually done, but it never reached the clipboard or history and the session had to be restarted. The session now finishes according to your settings.
Fixed the app getting stuck on the error state after the recognition service failed early in a recording, which blocked any new dictation. The error now clears after a brief display and the app is ready again.
Fixed half-written text being treated as the final result when the cleanup stream errored or was cut off mid-way. An interrupted stream now falls back to the complete raw transcript, so nothing is lost.
Fixed the 8-second text-processing limit not actually applying. Timeouts and Escape cancellation now take effect immediately and the session finishes as usual.