Update TOCInline.tsx

Enhances functionality by providing users with the option to customize the styling of list (li) elements. I'm currently utilizing this library and felt the need to personalize the appearance of my li elements. Therefore, I'm suggesting this modification to the library to ensure that everyone can take advantage of this improvement.

packages/pliny/src/ui/TOCInline.tsx

@@ -8,6 +8,7 @@ export interface TOCInlineProps {
   exclude?: string | string[]
   collapse?: boolean
   ulClassName?: string
+  liClassName?: string
 }
 
 export interface NestedTocItem extends TocItem {
@@ -57,6 +58,7 @@ const createNestedList = (items: TocItem[]): NestedTocItem[] => {
  *   exclude = '',
  *   collapse = false,
  *   ulClassName = '',
+ *   liClassName = '',
  * }
  *
  */
@@ -68,6 +70,7 @@ const TOCInline = ({
   exclude = '',
   collapse = false,
   ulClassName = '',
+  liClassName = '',
 }: TOCInlineProps) => {
   const re = Array.isArray(exclude)
     ? new RegExp('^(' + exclude.join('|') + ')$', 'i')
@@ -86,7 +89,7 @@ const TOCInline = ({
     return (
       <ul className={ulClassName}>
         {items.map((item, index) => (
-          <li key={index}>
+          <li key={index} className={liClassName}>
             <a href={item.url}>{item.value}</a>
             {createList(item.children)}
           </li>