feat: add keybinding to copy commit message

[wugeer]

This Pull Request fixes/closes #2370 .

It changes the following:

• add keybinding to copy commit message
• Run cargo clippy to format the code.

I followed the checklist:

• [ ] I added unittests
• [x] I ran make check without errors
• [x] I tested the overall application
• [x] I added an appropriate item to the changelog

录屏 2024-09-30 17-20-22.webm

@extrawurst Is it necessary to add a feature to copy the commit subject here? :)