feat(vlc): add desktop override with QT_SCALE_FACTOR for HiDPI

VLC 3's Qt interface ignores Wayland compositor scaling, so the UI
renders tiny on the 4K display (Hyprland scale 1.5). Shadow the system
launcher with QT_SCALE_FACTOR=1.5.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RLbJ5DWegXqY551kBAKGAf

.gitignore

@@ -74,5 +74,6 @@
 !.local/share/applications/
 !.local/share/applications/org.openrgb.OpenRGB.desktop
 !.local/share/applications/rquickshare.desktop
+!.local/share/applications/vlc.desktop
 !LICENSE
 !README.md