Feature request: Automatically change lock screen image when switching between light mode and dark mode

**Describe the enhancement or feature you'd like**
Automatically change lock screen image when switching between light mode and dark mode.

**Additional context**
OS Build: Windows 10 22H2 19045.2251
I use the `Windows theme switch` feature of this application to automatically change my theme. It works well when it comes to changing my desktop background image, but when it comes to the lock screen, it seems that the `.theme` file would not contain any lock screen image information, so the lock screen image is not going to change when switching between light and dark mode.
So, could you please add a feature to automatically change lock screen image when switching between light and dark mode? Thank you!

Start by tracing the existing Windows theme switch behavior and how it changes the desktop background. Inspect how the application handles .theme files and lock screen settings on Windows 10. Done means switching between light and dark mode also changes the lock screen image reliably on the reported Windows build.

Written by the indexing model from the issue text.