Replace PInvoke.User32 with Microsoft.Windows.CsWin32 source generator

[Copilot]

Remove the PInvoke.User32 NuGet package dependency and migrate all call sites to the Microsoft.Windows.CsWin32 source generator that was already partially adopted in the project.

Win32 API declarations

Added to XAMLTest/NativeMethods.txt: mouse_event, SetCursorPos, GetCursorPos, SendMessage, SendInput, GetAsyncKeyState, GetForegroundWindow, GetParent, GetWindowPlacement

Created XAMLTest.Tests/NativeMethods.txt with GetWindowPlacement for test project usage.

Type mapping

• mouse_eventFlags → MOUSE_EVENT_FLAGS
• VirtualKey → VIRTUAL_KEY
• KEYEVENTF → KEYBD_EVENT_FLAGS
• User32.InputType → INPUT_TYPE
• input.Inputs.ki → input.Anonymous.ki
• User32.WindowMessage.* → uint constants (WM_CHAR, WM_KEYDOWN, WM_KEYUP)
• IntPtr window handles → HWND (in VisualTreeService.cs)
• WindowShowStyle → SHOW_WINDOW_CMD

Package references

• Removed PInvoke.User32 from XAMLTest.csproj and Directory.Packages.props
• Added Microsoft.Windows.CsWin32 to XAMLTest.Tests.csproj

Example: KeyboardInput.cs before/after

// Before
input.Inputs.ki.wVk = modifierKey;
input.Inputs.ki.dwFlags = KEYEVENTF.KEYEVENTF_KEYUP;
User32.SendInput(1, new[] { input.Input }, sizeOfInputStruct);

// After
input.Anonymous.ki.wVk = modifierKey;
input.Anonymous.ki.dwFlags = KEYBD_EVENT_FLAGS.KEYEVENTF_KEYUP;
PInvoke.SendInput([input.Input], sizeOfInputStruct);

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