Initial commit: NexusArchitect Professional Workstation Overhaul

src/NexusReader.Application/Commands/Quiz/SubmitAnswerCommand.cs

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+using NexusReader.Application.Abstractions.Messaging;
+
+namespace NexusReader.Application.Commands.Quiz;
+
+public record SubmitAnswerCommand(int SelectedIndex, int CorrectIndex) : ICommand;

src/NexusReader.Application/Commands/Quiz/SubmitAnswerCommandHandler.cs

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+using FluentResults;
+using NexusReader.Application.Abstractions.Messaging;
+using NexusReader.Application.Abstractions.Services;
+
+namespace NexusReader.Application.Commands.Quiz;
+
+internal sealed class SubmitAnswerCommandHandler : ICommandHandler<SubmitAnswerCommand>
+{
+    private readonly IPlatformService _platformService;
+
+    public SubmitAnswerCommandHandler(IPlatformService platformService)
+    {
+        _platformService = platformService;
+    }
+
+    public async Task<Result> Handle(SubmitAnswerCommand request, CancellationToken cancellationToken)
+    {
+        if (request.SelectedIndex == request.CorrectIndex)
+        {
+            await _platformService.VibrateAsync(50);
+            return Result.Ok();
+        }
+        
+        return Result.Fail("Incorrect answer.");
+    }
+}