zigbee device graph visualization

src/lib/utils/color.ts

@@ -0,0 +1,19 @@
+export function hexToRgba(hex: string, alpha = 1) {
+  // Remove leading # if present
+  hex = hex.replace(/^#/, '');
+
+  // Handle shorthand (#fff → #ffffff)
+  if (hex.length === 3) {
+    hex = hex.split('').map(c => c + c).join('');
+  }
+
+  if (hex.length !== 6) {
+    throw new Error('Invalid HEX color.');
+  }
+
+  const r = parseInt(hex.substring(0, 2), 16);
+  const g = parseInt(hex.substring(2, 4), 16);
+  const b = parseInt(hex.substring(4, 6), 16);
+
+  return `rgba(${r}, ${g}, ${b}, ${alpha})`;
+}