[codex] Harden key repeat state reset

src/SoundType.Input/KeyboardHookService.cs

@@ -53,11 +53,13 @@ public void Stop()
     {
         if (_hookId == IntPtr.Zero)
         {
+            _pressedKeys.Clear();
             return;
         }
 
         _ = _platform.Unhook(_hookId);
         _hookId = IntPtr.Zero;
+        _pressedKeys.Clear();
     }
 
     private IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)

src/SoundType.Tests/KeyboardHookServiceTests.cs

@@ -52,6 +52,26 @@ public void KeyPressed_MarksSecondKeydownAsRepeatUntilKeyup()
             });
     }
 
+    [Fact]
+    public void Stop_ClearsPressedKeysSoRestartDoesNotMarkFreshKeydownAsRepeat()
+    {
+        FakeKeyboardHookPlatform platform = new();
+        using KeyboardHookService service = new(platform);
+        List<KeyPressedEvent> events = [];
+        service.KeyPressed += (_, e) => events.Add(e);
+
+        service.Start();
+        platform.Send(WmKeydown, AKey);
+        service.Stop();
+        service.Start();
+        platform.Send(WmKeydown, AKey);
+
+        Assert.Collection(
+            events,
+            first => Assert.False(first.IsRepeat),
+            afterRestart => Assert.False(afterRestart.IsRepeat));
+    }
+
     private sealed class FakeKeyboardHookPlatform : IKeyboardHookPlatform
     {
         private KeyboardHookService.LowLevelKeyboardProc? _callback;