Feature: Automatic wallpaper switch when appearance changes

[ToneXum]

Describe the requested feature:

Let users set a wallpaper for the light / dark theme of iOS (or iPadOS) and have the wallpaper switch automatically when the theme changes.

This is nice for having a brighter wallpaper at daytime and a darker one at night when the OS switches the theme automatically.

System information:

• iPadOS version: 16.2
• Device: iPad Pro (5th gen)
• Jailbreak: Dopamine 2.0.11