Auto mode doesn't work sometimes, especially on Batsukoishi

Auto mode will sometimes only show part of the dialogue, then wait until the voice has fully finished playing, before continuing with the rest of the dialogue

This bug might affect other chapters too.

According to our tester, this bug doesn't come up that often, but it's definitely worth fixing as auto-mode is annoying to use with this bug.

在程式碼庫中尋找自動模式邏輯，可能在對話或語音播放系統中。檢查 Batsukoishi 章節以尋找特定觸發器。測試自動模式以重現部分對話問題，並檢查文字顯示與語音完成之間的時序。

由索引模型根據 Issue 內容生成。