Add command interruption support with Ctrl+C and cancellation tokens

UI/CLI/Commands/StartGuiCommand.cs

@@ -18,11 +18,6 @@ public class StartGuiCommand : ICommand
             return Task.CompletedTask;
         }
 
-        foreach (Process process in ProcessManager.GetProcessesOfType<CliProcess>())
-        {
-            ProcessManager.StopProcess(process.Id);
-        }
-
         _ = ProcessManager.SpawnProcess<DesktopProcess>();
         return Task.CompletedTask;
     }

UI/CLI/Commands/StopGuiCommand.cs

@@ -22,7 +22,5 @@ public class StopGuiCommand : ICommand
         {
             await ProcessManager.StopProcessAndWaitAsync(process.Id);
         }
-
-        _ = ProcessManager.SpawnProcess<CliProcess>();
     }
 }

UI/CLI/Commands/YesNtCommand.cs

@@ -12,10 +12,18 @@ namespace RemSox.UI.CLI.Commands
 
         public string Description => "Start the YesNt interpreter";
 
+        private int processId;
+
         public async Task ExecuteAsync(string? arguments, Action<string> printLine)
         {
-            int processId = ProcessManager.SpawnProcess<Processes.YesNtInterpreterProcess>(arguments?.Split(',') ?? []);
+            processId = ProcessManager.SpawnProcess<Processes.YesNtInterpreterProcess>(arguments?.Split(',') ?? []);
             await ProcessManager.WaitForProcessExitAsync(processId);
         }
+
+        public Task StopAsync()
+        {
+            ProcessManager.StopProcess(processId);
+            return Task.CompletedTask;
+        }
     }
 }