docs: Update extension-showcase.yml (#2457)

Author: Sbrjt

docs/assets/extension-showcase.yml

@@ -514,3 +514,6 @@
 
 - # CopyApes Assistant
   chromeId: affmjifigldmicnbgpghddaneomejmfo
+
+- # Leetcode Enhancer
+  chromeId: cpoclfijojgjiafnlgnhjalkaiabcjch