Add divider under extension details header

app/src/main/res/layout/extension_detail_header.xml

@@ -125,4 +125,8 @@
 
     </androidx.constraintlayout.widget.ConstraintLayout>
 
+    <com.google.android.material.divider.MaterialDivider
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content" />
+
 </LinearLayout>