feat: scale `leading` widgets based on paragraph font size

lib/src/widgets/text_block.dart

@@ -170,45 +170,47 @@ class EditableTextBlock extends StatelessWidget {
 
   Widget? _buildLeading(BuildContext context, Line line, int index,
       Map<int, int> indentLevelCounts, int count) {
-    final defaultStyles = QuillStyles.getStyles(context, false);
+    final defaultStyles = QuillStyles.getStyles(context, false)!;
+    final fontSize = defaultStyles.paragraph?.style.fontSize ?? 16;
     final attrs = line.style.attributes;
+
     if (attrs[Attribute.list.key] == Attribute.ol) {
       return QuillNumberPoint(
         index: index,
         indentLevelCounts: indentLevelCounts,
         count: count,
-        style: defaultStyles!.leading!.style,
+        style: defaultStyles.leading!.style,
         attrs: attrs,
-        width: 32,
+        width: fontSize * 2,
-        padding: 8,
+        padding: fontSize / 2,
       );
     }
 
     if (attrs[Attribute.list.key] == Attribute.ul) {
       return QuillBulletPoint(
         style:
-            defaultStyles!.leading!.style.copyWith(fontWeight: FontWeight.bold),
+            defaultStyles.leading!.style.copyWith(fontWeight: FontWeight.bold),
-        width: 32,
+        width: fontSize * 2,
       );
     }
 
     if (attrs[Attribute.list.key] == Attribute.checked) {
       return CheckboxPoint(
-        size: 14,
+        size: fontSize,
         value: true,
         enabled: !readOnly,
         onChanged: (checked) => onCheckboxTap(line.documentOffset, checked),
-        uiBuilder: defaultStyles?.lists?.checkboxUIBuilder,
+        uiBuilder: defaultStyles.lists?.checkboxUIBuilder,
       );
     }
 
     if (attrs[Attribute.list.key] == Attribute.unchecked) {
       return CheckboxPoint(
-        size: 14,
+        size: fontSize,
         value: false,
         enabled: !readOnly,
         onChanged: (checked) => onCheckboxTap(line.documentOffset, checked),
-        uiBuilder: defaultStyles?.lists?.checkboxUIBuilder,
+        uiBuilder: defaultStyles.lists?.checkboxUIBuilder,
       );
     }
 
@@ -217,11 +219,11 @@ class EditableTextBlock extends StatelessWidget {
         index: index,
         indentLevelCounts: indentLevelCounts,
         count: count,
-        style: defaultStyles!.code!.style
+        style: defaultStyles.code!.style
             .copyWith(color: defaultStyles.code!.style.color!.withOpacity(0.4)),
-        width: 32,
+        width: fontSize * 2,
         attrs: attrs,
-        padding: 16,
+        padding: fontSize,
         withDot: false,
       );
     }