ユーザーメンションコンポーネント

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      <p class="text-gray-800 dark:text-gray-200 font-semibold">John Doe</p>
      <p class="text-gray-600 dark:text-gray-400 text-sm">Mentioned you in a comment:</p>
      <p class="text-gray-700 dark:text-gray-300 mt-1">"Hey, check out this new feature!"</p>
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