fix: Remove activateWindow() call to fix focus warning

Widgets have Qt::WindowDoesNotAcceptFocus flag set so they don't
steal focus from the game. Calling activateWindow() on them
produces a warning.

Removed activateWindow() call since:
1. Widgets should not accept focus (they're overlays)
2. raise_() is sufficient to bring them to front
3. WindowDoesNotAcceptFocus is intentional for game overlay widgets

core/overlay_window.py

@@ -1750,10 +1750,9 @@ class OverlayWindow(QMainWindow):
             y = (screen.height() - 100) // 2
             widget.move(x, y)
             
-            # Show and raise
+            # Show and raise (don't activate - widgets have WindowDoesNotAcceptFocus)
             widget.show()
             widget.raise_()
-            widget.activateWindow()
             
             # Store reference to prevent garbage collection
             if not hasattr(self, '_active_widgets'):