feat: support darkmode in node link visualization

Simple change to support dark mode in the node link visualization. In principe all chosen colors work fine in dark mode, we just have to ensure the background is not forced to be white.

Preview

Before

After

libs/shared/lib/vis/visualizations/nodelinkvis/components/NLPixi.tsx

@@ -50,7 +50,7 @@ export const NLPixi = (props: Props) => {
   const app = useMemo(
     () =>
       new Application({
-        background: 0xffffff,
+        backgroundAlpha: 0,
         antialias: true,
         autoDensity: true,
         eventMode: 'auto',