Fix HTML closing tag typo in playground error display

There is a typo in the HTML closing tag used in the printResult() function within the playground files. The closing tag is used instead of , which breaks the HTML structure and prevents error messages from rendering correctly in the output element.

Affected Files

playground.js — Line 58
playground.js — Line 45

Current Code (Broken)

outputElement.innerHTML = <code> Error: ${escapedMessage} Stack: ${escapedStack}</co>;

Expected Code (Fixed)

outputElement.innerHTML = <code> Error: ${escapedMessage} Stack: ${escapedStack}</code>;

Steps to Reproduce

Navigate to the playground files in the auth or api packages.
Trigger an error within the playground.
Observe the output element.

Expected Behavior
Error messages should render correctly inside a HTML element, with properly matched opening and closing tags.

Open the playground.js files in the auth and api packages and inspect the printResult() function around lines 45 and 58. Trigger an error in each playground to reproduce the malformed output, then verify that the error and stack render inside a correctly matched code element.