Fix process detection bugs and resource leaks in AppApiElectron (GameHandler.cs) (#1444)

* Fix process detection and resource leaks

Critical bugs:
- Fix VRChat detection by removing .exe from process name

Performance:
- Use GetProcessesByName() to avoid scanning all processes
- Optimize IsSteamVRRunning to check exact matches first

Resource management:
- Add Process.Dispose() calls to prevent handle leaks
- Standardize on Dispose() instead of Close()

* Fix broken ExitCode check in StartGame

Remove ExitCode check that always threw an exception. You cannot access
Process.ExitCode on a process that is still running~ it throws
InvalidOperationException. Steam stays running after starting VRChat,
so this check always failed.

Simplified to return true when Process.Start() succeeds, since Steam
handles VRChat launch asynchronously and there's no way to verify
immediate success.

Also changed Close() to Dispose() for consistency.

Dotnet/AppApi/Electron/GameHandler.cs

@@ -31,32 +31,44 @@ namespace VRCX
 
         public override bool IsGameRunning()
         {
-            var isGameRunning = false;
-            var processes = Process.GetProcesses();
+            var processes = Process.GetProcessesByName("VRChat");
+            var isGameRunning = processes.Length > 0;
+
             foreach (var process in processes)
-            {
-                if (process.ProcessName == "VRChat.exe")
-                {
-                    isGameRunning = true;
-                    break;
-                }
-            }
+                process.Dispose();
             return isGameRunning;
         }
 
         public override bool IsSteamVRRunning()
         {
-            var isSteamVRRunning = false;
-            var processes = Process.GetProcesses();
-            foreach (var process in processes)
+            // Check exact matches (fast - no full process scan needed)
+            var processNames = new[] { "vrmonitor", "monado-service" };
+            foreach (var name in processNames)
             {
-                if (process.ProcessName == "vrmonitor" || process.ProcessName == "monado-service" || process.ProcessName.EndsWith("wivrn-server"))
+                var processes = Process.GetProcessesByName(name);
+                var isSteamVRRunning = processes.Length > 0;
+
+                foreach (var process in processes)
+                    process.Dispose();
+                if (isSteamVRRunning)
+                    return true;
+            }
+            
+            // Check for wivrn-server (requires full scan)
+            var allProcesses = Process.GetProcesses();
+            var isRunning = false;
+            foreach (var process in allProcesses)
+            {
+                if (process.ProcessName.EndsWith("wivrn-server"))
                 {
-                    isSteamVRRunning = true;
+                    isRunning = true;
                     break;
                 }
             }
-            return isSteamVRRunning;
+
+            foreach (var process in allProcesses)
+                process.Dispose();
+            return isRunning;
         }
 
         public override int QuitGame()
@@ -65,6 +77,8 @@ namespace VRCX
             if (processes.Length == 1)
                 processes[0].Kill();
 
+            foreach (var process in processes)
+                process.Dispose();
             return processes.Length;
         }
 
@@ -78,12 +92,8 @@ namespace VRCX
                     Arguments = $"-applaunch 438100 {arguments}",
                     UseShellExecute = false,
                 });
-                if (process?.ExitCode == 0)
-                {
-                    process.Close();
-                    return true;
-                }
-                process?.Close();
+                process?.Dispose();
+                return true; // Steam accepted launch command (no exception thrown)
             }
             catch (Exception e)
             {
@@ -111,7 +121,7 @@ namespace VRCX
                     FileName = steamExecutable,
                     Arguments = $"-applaunch 438100 {arguments}",
                     UseShellExecute = false,
-                })?.Close();
+                })?.Dispose();
 
                 return true;
             }