merge dev into master

[yanjinhuagood]

This pull request includes several changes to update resource paths, add new package references, and refactor code to improve maintainability and consistency. The most important changes are grouped into resource updates, package references, and code refactoring.

Resource Updates:

• Updated the resource path for background.png from AnimationNavigationBar3D to NavMenu3D in src/Resources.props.

Package References:

• Added Microsoft.Win32.SystemEvents package reference for multiple target frameworks in src/TargetFrameworks.props. [1] [2]

Code Refactoring:

• Replaced various DynamicResource keys in src/WPFDevelopers.Net40/Themes/Generic.xaml and src/WPFDevelopers.Net45x/Themes/Generic.xaml to use more consistent naming conventions (e.g., WD.WindowForegroundColorBrush to WD.WindowTextBrush). [1] [2]
• Refactored src/WPFDevelopers.Net40/Window.cs to remove redundant code and improve readability, including the use of MonitorHelper and updating the MaximizeWindow method. [1] [2]