feat: add opacity and blur controls for background settings, enhancing customization options in the UI

package.json

@@ -22,6 +22,7 @@
     "@radix-ui/react-progress": "^1.1.2",
     "@radix-ui/react-radio-group": "^1.3.8",
     "@radix-ui/react-select": "^2.1.6",
+    "@radix-ui/react-slider": "^1.3.6",
     "@radix-ui/react-slot": "1.2.3",
     "@radix-ui/react-toast": "1.2.15",
     "@types/bcryptjs": "^3.0.0",