fix failing custom-tags test

[sanjana2505006]

This PR resolves issue #1231

Fix: Test failure in packages/twoslash/test/rich.test.ts due to unresolved imports

Summary

This pull request fixes a failing test in packages/twoslash/test/rich.test.ts by adding an expected error annotation (// @errors: 2307).

Description

The custom-tags test imports shiki/core and shiki/engine/javascript, which cannot be resolved in the Twoslash test environment. As a result, TypeScript error 2307 (Cannot find module) is thrown and the test fails because the error was not marked as expected.

Reproduction

pnpm test packages/twoslash/test/rich.test.ts


###Error

> These errors were not marked as being expected: 2307
Proposed Fix

Add the following annotation to the test case:

> // @errors: 2307
###Verification
- `pnpm test packages/twoslash/test/rich.test.ts` → **Passed**  
- Full suite: `pnpm test` → **Passed**

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.20%. Comparing base (28dd090) to head (8fe4d35).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1232   +/-   ##
=======================================
  Coverage   95.20%   95.20%           
=======================================
  Files          92       92           
  Lines        7922     7922           
  Branches     1689     1690    +1     
=======================================
  Hits         7542     7542           
  Misses        374      374           
  Partials        6        6           

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[sanjana2505006]

Hello @antfu,
Could you please let me know if this looks valid and if there are any changes I should make?