**Changes applied:**
1. **Modified `frontend/src/components/ui/wysiwyg.tsx`**:
- Updated the `theme.link` property to use `text-blue-600` (light mode) and `dark:text-blue-400` (dark mode).
- Added hover states `hover:text-blue-800` and `dark:hover:text-blue-300` for better interactivity.
This change ensures links are clearly visible and themed correctly in user messages and all other places where the `WYSIWYGEditor` is used for markdown rendering.
I verified the changes by running `pnpm run check`, which passed successfully.