[FEATURE]:Add a right-side navigation panel

[Hourthink]

Feature hasn't been suggested before.

• I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

Desktop app: Add a right-side conversation navigation panel (like DeepSeek web) for quick access to each turn

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• [FEATURE]:Chat Navigation Index / Sidebar #25910: [FEATURE]:Chat Navigation Index / Sidebar — describes the same right-side collapsible navigation panel for jumping between conversation turns