refactor: use System.Threading.Lock for the remaining monitor locks

SysManager/SysManager/Services/AppAlertService.cs

@@ -17,7 +17,7 @@ namespace SysManager.Services;
 public sealed class AppAlertService : IDisposable
 {
     private readonly List<FileSystemWatcher> _watchers = new();
-    private readonly object _watcherLock = new();
+    private readonly Lock _watcherLock = new();
     private readonly ConcurrentDictionary<string, bool> _knownFolders = new(StringComparer.OrdinalIgnoreCase);
     private readonly ConcurrentDictionary<string, bool> _knownRegistryApps = new(StringComparer.OrdinalIgnoreCase);
     private readonly SynchronizationContext? _syncContext;

SysManager/SysManager/Services/IconExtractorService.cs

@@ -24,7 +24,7 @@ public sealed partial class IconExtractorService
 {
     private static readonly ConcurrentDictionary<string, ImageSource?> _cache = new(StringComparer.OrdinalIgnoreCase);
     private static readonly Queue<string> _insertionOrder = new();
-    private static readonly object _evictionLock = new();
+    private static readonly Lock _evictionLock = new();
 
     /// <summary>Maximum number of cached icons before eviction kicks in.</summary>
     public static int MaxCacheSize { get; set; } = 500;

SysManager/SysManager/Services/PingMonitorService.cs

@@ -31,7 +31,7 @@ public sealed class PingMonitorService : IDisposable
 
     private CancellationTokenSource? _cts;
     private Task? _loop;
-    private readonly object _stateLock = new();
+    private readonly Lock _stateLock = new();
 
     public bool IsRunning => _loop is { IsCompleted: false };
 

SysManager/SysManager/Services/SystemInfoService.cs

@@ -18,7 +18,7 @@ public sealed class SystemInfoService
     private OsInfo? _cachedOs;
     private CpuInfo? _cachedCpuStatic;
     private List<DiskInfo>? _cachedDisks;
-    private readonly object _cacheLock = new();
+    private readonly Lock _cacheLock = new();
 
     public Task<SystemSnapshot> CaptureAsync(CancellationToken ct = default)
         => Task.Run(() => Capture(), ct);

SysManager/SysManager/Services/TracerouteMonitorService.cs

@@ -32,7 +32,7 @@ public sealed class TracerouteMonitorService : IDisposable
 
     private CancellationTokenSource? _cts;
     private Task? _loop;
-    private readonly object _stateLock = new();
+    private readonly Lock _stateLock = new();
 
     public bool IsRunning => _loop is { IsCompleted: false };
 

SysManager/SysManager/ViewModels/ConsoleViewModel.cs

@@ -17,7 +17,7 @@ namespace SysManager.ViewModels;
 public sealed partial class ConsoleViewModel : ObservableObject
 {
     private const int MaxLines = 5000;
-    private readonly object _gate = new();
+    private readonly Lock _gate = new();
 
     public ObservableCollection<PowerShellLine> Lines { get; } = new();