Fix VoiceAccessUserControl header file with proper WinRT/C++/CX syntax

[Copilot]

This PR implements a complete VoiceAccessUserControl header file with proper WinRT/C++/CX syntax to address the missing implementation in the Windows classic samples repository.

Changes Made

1. Proper Property Declarations

• Implemented Mode and IsVoiceEnabled properties using correct WinRT/C++/CX syntax
• Properties follow the established pattern from TabViewModel.h with proper getter/setter methods
• Used appropriate WinRT types (winrt::hstring and bool)

2. INotifyPropertyChanged Implementation

• Added complete PropertyChanged event handling with proper add/remove methods
• Implemented NotifyChange template method for efficient property change notifications
• Property setters automatically trigger notifications for data binding support

3. UpdateModeDisplay Method

• Properly declared UpdateModeDisplay() method
• Implementation updates display based on current mode and voice enabled state
• Called automatically when properties change to maintain UI consistency

4. Necessary Include Statements

• Added winrt/Microsoft.UI.Xaml.Data.h for INotifyPropertyChanged support
• Added winrt/Windows.UI.Xaml.Controls.h for UserControl base class
• Included generated header file for proper WinRT component integration

5. Complete XAML UserControl Integration

• Created supporting implementation file (.cpp) with proper property logic
• Added IDL definition for runtime class declaration
• Included XAML file demonstrating data binding capabilities
• Proper factory implementation for WinRT component instantiation

Code Structure

The implementation follows the exact same patterns as the existing TabViewModel.h in the repository:

struct VoiceAccessUserControl : VoiceAccessUserControlT<VoiceAccessUserControl>
{
    // Property declarations with proper WinRT syntax
    winrt::hstring Mode() const;
    void Mode(winrt::hstring const& value);
    
    // INotifyPropertyChanged implementation
    winrt::event_token PropertyChanged(winrt::Microsoft::UI::Xaml::Data::PropertyChangedEventHandler const& handler);
    void PropertyChanged(winrt::event_token token);
    
    // Method declaration
    void UpdateModeDisplay();
};

Files Added

• VoiceAccessUserControl.h - Main header file with proper WinRT/C++/CX syntax
• VoiceAccessUserControl.cpp - Implementation with property logic and notifications
• VoiceAccessUserControl.idl - Runtime class definition for WinRT component
• VoiceAccessUserControl.xaml - XAML UserControl with data binding examples

This implementation provides a complete, working example of proper WinRT/C++/CX syntax for XAML UserControls with full data binding support, following established patterns in the Windows classic samples repository.

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