feat(ui): replace the status bar with operation history

[Limdongcheng]

Summary

• Remove the bottom status bar and its visibility preference.
• Add a Ribbon entry for operation history with the current status in its tooltip.
• Record up to 200 recent status messages and show them newest first in a Messages tab.
• Clear status messages together with diagnostic history and retain diagnostic reports in a separate tab.
• Show the current status and active dataset summary in the history window.
• Update the English and Simplified Chinese documentation.

Validation

• cargo pr-check on macOS arm64.
• npm run build in docs/.
• git diff --check.
• Regression tests cover history capacity, duplicate messages, clearing, and opening diagnostic details after viewing messages.
• Screenshot harness: operation history in light and dark themes.

UI display logic

• The history entry uses the existing searchable Operation History command.
• History updates leave the window's visibility unchanged.
• Empty history shows a next-step message.
• English and Simplified Chinese documentation updated.