Make destructive operation progress honest

[cauyxy]

Summary

• Add a shared target-bearing confirmation lifecycle for cleanup, reset, and video deletion.
• Block misleading dismissal while non-cancelable native work runs, retain semantic failure context for retry or safe exit, and close only on success.
• Return semantic problems from cleanup IPC and update bilingual presentation and truth documentation.

Testing

• npm run verify -- --source-only
• Browser Preview at http://127.0.0.1:14207/ (cleanup target/copy, backdrop, layout, console)
• macOS npm run tauri dev startup smoke; real install detection succeeded; overlay and settings returned HTTP 200
• Destructive native actions were not executed against user data

Closes #27

Release Notes:

• 清理、重置和删除操作现在会明确显示目标，并在不可取消的执行期间阻止误导性的关闭或取消操作。