Removing margin on last p tags (#299)

## Description

Removing extra margin on the last p tags in the box components

## Screenshot (optional)

Before:
<img width="858" height="148" alt="image"
src="https://github.com/user-attachments/assets/e3335e8d-90e1-4c32-bc16-0814c6a28771"
/>

After:
<img width="856" height="142" alt="image"
src="https://github.com/user-attachments/assets/ff22143b-1c1b-4aba-81ab-e8e26882d201"
/>

Author: jakebayliss

components/embeds/boxEmbed.tsx

@@ -93,7 +93,7 @@ export function BoxEmbed(props: any) {
       <div className={`p-4 rounded-sm my-4 ${config.containerClass}`}>
         <div className="flex items-start">
           {config.icon}
-          <div className={`${config.textClass ?? ""}`}>
+          <div className={`[&_p:last-child]:mb-0 ${config.textClass ?? ""}`}>
             <div>
               <TinaMarkdown content={data.body} components={MarkdownComponentMapping} />
             </div>