Fix fullscreen window geometry to prevent bottom content from going out of view

- Use availableGeometry() instead of full screen geometry for fullscreen mode
- This accounts for taskbars, panels, and other system UI elements that may overlap
- Set window geometry to available screen space before calling showFullScreen()
- Ensures all GUI content remains visible in fullscreen mode
- Resolves issue where bottom part of fullscreen window was hidden/cut off

This fixes the fullscreen display issue where the window extended beyond
the visible screen area, making the bottom content inaccessible.

autoinstaller_gui/autoinstallergui.py

@@ -1119,6 +1119,12 @@ def main():
     window = AutoInstallerGUI()
 
     if not args.no_fullscreen:
+        # Get available screen geometry to handle fullscreen properly
+        screen = app.primaryScreen()
+        available_geometry = screen.availableGeometry()
+
+        # Set window geometry to available screen space (excluding taskbars/panels)
+        window.setGeometry(available_geometry)
         window.showFullScreen()
     else:
         window.show()