Operation History
All operations are recorded automatically, free forever. Each entry includes: input/output path, file size, compression ratio, status and time.

Common Actions
- Reuse parameters: click the refresh icon to restore the exact parameters and jump to the optimization page
- Preview file: click the eye icon to open a historical output file in the viewer
- Export report: click "Export Report" and choose CSV (data stats) or HTML (visualized) format

- Clear history: irreversible — export a report first
History is stored locally, up to 100 entries, and persists across app restarts.