v10 Fixes from player feedback

Quick batch of fixes flagged by players:

🎬 Two videos re-rendered — the dashcam and the old wu taxi entry. Dates correct, driver's seat is back on the left where it belongs.

📝 Zhao Kai's disappearance timeline is now clearly written — no more confusion about whether it was Nov. 3 or Nov. 4 (they were two different days, two different events).

💾 English and 繁體 players: the save slot picker was leaking Chinese text. Translations filled in now.

🌐 Language toggle button: the cycle was busted (in 繁體 it would go back to 中文 instead of forward to English). Fixed — 中文 → 繁體 → English → 中文 now works as expected.

Thanks to everyone who keeps catching these for me.