UI Bug Fix: Opaque Background for Dark Theme Drawers (PR #249)

Hello Moqui Team,

I have submitted a Pull Request to fix a visual bug where the left navigation sidebar drawer (q-drawer) renders with a transparent background in Dark Theme. This causes underlying table contents (like in Entity Find) to overlap with the menu text upon horizontal scrolling.

Issue: https://github.com/moqui/moqui-runtime/issues/248
Pull Request: https://github.com/moqui/moqui-runtime/pull/249

The code changes are limited strictly to WebrootVue.qvt.css to add the required solid background color override for the drawer in dark mode. Kindly review it when time permits.

Thanks,
Amogh Parmar