feat: Reduce inline code button size

The default button size is too large and dominating for the context of
inline code within AI assistant responses.

src/components/content-tab-assistant.tsx

@@ -77,7 +77,7 @@ const ActionButton = ( {
 		<Button
 			onClick={ handleClick }
 			variant="outlined"
-			className="mr-2 font-sans select-none"
+			className="h-auto mr-2 !px-2.5 py-0.5 font-sans select-none"
 			disabled={ disabled }
 		>
 			{ icon }