feat: add theme selection and pathfinder theme

assets/js/hooks/Mapper/components/map/hooks/useBackgroundVars.ts

@@ -0,0 +1,42 @@
+import { useEffect, useState } from 'react';
+import { BackgroundVariant } from 'reactflow';
+
+
+export function useBackgroundVars(themeName?: string) {
+  const [variant, setVariant] = useState<BackgroundVariant>(BackgroundVariant.Dots);
+  const [gap, setGap] = useState<number>(16);
+  const [size, setSize] = useState<number>(1);
+  const [color, setColor] = useState('#81818b')
+
+  useEffect(() => { 
+    let themeEl = document.querySelector('.pathfinder-theme, .neon-theme');
+    if (!themeEl) {
+      themeEl = document.documentElement;
+    }
+
+    const style = getComputedStyle(themeEl as HTMLElement);
+
+    const rawVariant = style.getPropertyValue('--rf-bg-variant').replace(/['"]/g, '').trim().toLowerCase();
+    let finalVariant: BackgroundVariant = BackgroundVariant.Dots;
+    if (rawVariant === 'lines') {
+      finalVariant = BackgroundVariant.Lines;
+    } else if (rawVariant === 'cross') {
+      finalVariant = BackgroundVariant.Cross;
+    }
+
+    const cssVarGap = style.getPropertyValue('--rf-bg-gap');
+    const cssVarSize = style.getPropertyValue('--rf-bg-size');
+    const cssColor = style.getPropertyValue('--rf-bg-color');
+
+    const gapNum = parseInt(cssVarGap, 10) || 16;
+    const sizeNum = parseInt(cssVarSize, 10) || 1;
+
+    setVariant(finalVariant);
+    setGap(gapNum);
+    setSize(sizeNum);
+    setColor(cssColor);
+
+  }, [themeName]); 
+
+  return { variant, gap, size, color };
+}