fix: Fix widget not appearing - store reference and set proper position

ISSUE: Clock and System Monitor widgets were created but not visible.
The widgets were being garbage collected because they weren't stored.

FIX:
1. Store widget in self._active_widgets list to prevent GC
2. Set parent=self to keep widget alive with overlay
3. Position widget at center of screen (visible location)
4. Call raise_() and activateWindow() to bring to front
5. Added debug output showing widget position

WIDGET CREATION NOW:
- Creates widget with parent
- Positions at center of screen
- Shows, raises, activates
- Stores reference in list
- Prints position for debugging

core/overlay_window.py

@@ -1736,18 +1736,58 @@ class OverlayWindow(QMainWindow):
         """Add a clock widget to the overlay."""
         try:
             from core.widget_system import ClockWidget
-            widget = ClockWidget()
+            
+            # Create widget with self as parent
+            widget = ClockWidget(parent=self)
+            
+            # Position near center of screen
+            screen = QApplication.primaryScreen().geometry()
+            x = (screen.width() - 200) // 2
+            y = (screen.height() - 100) // 2
+            widget.move(x, y)
+            
+            # Show and raise
             widget.show()
-            print("[Overlay] Clock widget added")
+            widget.raise_()
+            widget.activateWindow()
+            
+            # Store reference to prevent garbage collection
+            if not hasattr(self, '_active_widgets'):
+                self._active_widgets = []
+            self._active_widgets.append(widget)
+            
+            print(f"[Overlay] Clock widget added at ({x}, {y})")
         except Exception as e:
             print(f"[Overlay] Error adding clock widget: {e}")
+            import traceback
+            traceback.print_exc()
     
     def _add_system_monitor_widget(self):
         """Add a system monitor widget to the overlay."""
         try:
             from core.widget_system import SystemMonitorWidget
-            widget = SystemMonitorWidget()
+            
+            # Create widget with self as parent
+            widget = SystemMonitorWidget(parent=self)
+            
+            # Position below the clock
+            screen = QApplication.primaryScreen().geometry()
+            x = (screen.width() - 200) // 2
+            y = (screen.height() - 100) // 2 + 120
+            widget.move(x, y)
+            
+            # Show and raise
             widget.show()
-            print("[Overlay] System monitor widget added")
+            widget.raise_()
+            widget.activateWindow()
+            
+            # Store reference to prevent garbage collection
+            if not hasattr(self, '_active_widgets'):
+                self._active_widgets = []
+            self._active_widgets.append(widget)
+            
+            print(f"[Overlay] System monitor widget added at ({x}, {y})")
         except Exception as e:
             print(f"[Overlay] Error adding system monitor widget: {e}")
+            import traceback
+            traceback.print_exc()