Initial

client/src/components/chat-mark-unread-button/chat-mark-unread-button.component.jsx

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+import { MailOutlined } from "@ant-design/icons";
+import { Button, Tooltip } from "antd";
+import { useTranslation } from "react-i18next";
+
+export default function ChatMarkUnreadButton({ disabled, loading, onMarkUnread }) {
+  const { t } = useTranslation();
+
+  return (
+    <Tooltip title={t("messaging.labels.mark_unread")}>
+      <Button
+        size="small"
+        icon={<MailOutlined />}
+        loading={loading}
+        disabled={disabled}
+        onMouseDown={(e) => e.stopPropagation()} // prevent parent mark-read handler
+        onClick={(e) => {
+          e.stopPropagation();
+          onMarkUnread?.();
+        }}
+      />
+    </Tooltip>
+  );
+}