fix(taskbar): prevent closing of pinned-only buttons

- Added a check to avoid closing buttons that represent pinned applications when their hwnd is negative.
- This ensures that pinned apps that are not currently running remain unaffected by close actions.

Author: amnweb

src/core/widgets/yasb/taskbar.py

@@ -1417,6 +1417,10 @@ def _on_close_app(self) -> None:
             logging.warning("No hwnd found for widget.")
             return
 
+        # Don't close pinned-only buttons (negative hwnd = placeholder for pinned apps not running)
+        if hwnd < 0:
+            return
+
         # Check if the window is valid before attempting to close it
         if win32gui.IsWindow(hwnd):
             close_application(hwnd)