fix(useFontProperties.ts): change default font-family to DEFAULT_FONT

The default font-family was hardcoded to "Arial". This commit changes the default value to DEFAULT_FONT, which is defined in atomConfigs. This ensures that the default font-family is consistent throughout the application.

packages/editor-toolbar/src/hooks/useFontProperties.ts

@@ -9,6 +9,7 @@ import {
   fontSizeAtom,
   fontFamilyAtom,
   FontFamily,
+  DEFAULT_FONT,
 } from "../context/atomConfigs"
 
 const useFontProperties = () => {
@@ -30,7 +31,7 @@ const useFontProperties = () => {
       $getSelectionStyleValueForProperty(
         selection,
         "font-family",
-        "Arial",
+        DEFAULT_FONT,
       ) as FontFamily,
     )
   }, [setIsBold, setIsItalic, setIsUnderlined, setFontSize, setFontFamily])