Fix C# build errors: TimeSpan conversion, missing using statements, and nullable reference types

[Copilot]

This PR resolves several C# compilation errors that were preventing the project from building successfully.

Issues Fixed

1. TimeSpan to int conversion errors (CS0029)

The WSManConnectionInfo timeout properties expect int values in milliseconds, but were being assigned TimeSpan objects directly:

// Before - caused CS0029 compilation error
connectionInfo.OperationTimeout = TimeSpan.FromMinutes(2);
connectionInfo.OpenTimeout = TimeSpan.FromSeconds(30);

// After - converts TimeSpan to milliseconds
connectionInfo.OperationTimeout = (int)TimeSpan.FromMinutes(2).TotalMilliseconds;
connectionInfo.OpenTimeout = (int)TimeSpan.FromSeconds(30).TotalMilliseconds;

2. Missing namespace for PSRemotingTransportException (CS0246)

Added the required using statement to resolve PowerShell remoting exceptions:

using System.Management.Automation.Remoting;

This fixes the compilation error when catching PSRemotingTransportException in the remote PowerShell execution code.

3. Nullable reference type warnings (CS8603, CS8604, CS8612)

Updated event declarations, method signatures, and property types to properly handle nullable reference types:

• PropertyChangedEventHandler → PropertyChangedEventHandler?
• Method parameters like string propertyName → string? propertyName
• String properties that can be null now use string? type annotations
• Updated helper methods SecureStringToString and StringToSecureString to handle nullable inputs/outputs

Impact

• Resolves all compilation errors that were blocking builds
• Improves type safety with proper nullable annotations
• Maintains backward compatibility - no breaking changes to public API
• Follows C# 8.0+ nullable reference type best practices

The changes are minimal and surgical, addressing only the specific compilation issues without modifying application logic or functionality.

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