ユーザーメンションコンポーネント

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    <h2 class="text-lg font-semibold mb-2">Mentions</h2>
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            <p class="font-medium">John Doe</p>
            <p class="text-gray-400 text-sm">@johndoe</p>
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            <p class="font-medium">Jane Smith</p>
            <p class="text-gray-400 text-sm">@janesmith</p>
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            <p class="font-medium">Mike Johnson</p>
            <p class="text-gray-400 text-sm">@mikejohnson</p>
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