Refactors the window management system to include a `desktopId` property for each window, allowing windows to be associated with specific virtual desktops. This change impacts the `WindowState` interface, `openApp`, `closeWindow`, and `onLoadLayout` functions, and updates the rendering of windows in the taskbar and main display to only show windows belonging to the `currentDesktop`. Additionally, new tray panel states for audio and battery have been introduced.
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