Plexamp issues with Light/Dark setting

Hello,

I am aware of the warning stating that using System Window Controls requires a restart. however, the 2 issues below are different:

1. when using a dark theme and Options -> Experience -> Desktop Integration -> Use System Window Controls, the window decoration are always shown as light mode (even after restart), even when using dark mode. This looks very out of place.

2. In addition, when changing the system setting from Dark to Light, the theme colour changes (to grey), but if the system setting is set to Dark again, the theme remains grey. A restart of Plexamp is required for it to go dark. Why does is it able to change from Dark to Light but not Light to Dark?

No source file or test is named. Reproduce both dark/light transitions with Use System Window Controls enabled, then trace the desktop integration and theme-handling entry points. Done means window decorations follow dark mode and switching from Light to Dark updates without restarting Plexamp.

Written by the indexing model from the issue text.