Added a new test file `tests/unit/comment-avatar.test.mjs` to comprehensively test the `commentAvatar.js` utility. The tests cover:
- `normalizeCommentAvatarKey`: Verifies input sanitization and normalization.
- `resolveCommentAvatarAsset`: Verifies avatar resolution logic including defaults, failure handling, and caching strategies.
- `registerCommentAvatarFailure`: Verifies failure registration and cache invalidation.
This ensures robust handling of user avatars in comments, including edge cases like missing or failed images and cache persistence.
Co-authored-by: PR0M3TH3AN <[email protected]>
