Split message content into its own module

This is laying some groundwork for the rich text chatbar.

src/messagecontent/models/pollanswermodel.h

@@ -0,0 +1,57 @@
+// SPDX-FileCopyrightText: 2025 James Graham <james.h.graham@protonmail.com>
+// SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+
+#pragma once
+
+#include <QAbstractListModel>
+#include <QQmlEngine>
+
+class PollHandler;
+
+/**
+ * @class PollAnswerModel
+ *
+ * This class defines the model for visualising a list of answer to a poll.
+ */
+class PollAnswerModel : public QAbstractListModel
+{
+    Q_OBJECT
+    QML_ELEMENT
+    QML_UNCREATABLE("")
+
+public:
+    /**
+     * @brief Defines the model roles.
+     */
+    enum Roles {
+        IdRole, /**< The ID of the answer. */
+        TextRole, /**< The answer text. */
+        CountRole, /**< The number of people who gave this answer. */
+        LocalChoiceRole, /**< Whether this option was selected by the local user */
+        IsWinnerRole, /**< Whether this option was selected by the local user */
+    };
+    Q_ENUM(Roles)
+
+    explicit PollAnswerModel(PollHandler *parent);
+
+    /**
+     * @brief Get the given role value at the given index.
+     *
+     * @sa QAbstractItemModel::data
+     */
+    QVariant data(const QModelIndex &index, int role) const override;
+
+    /**
+     * @brief Number of rows in the model.
+     *
+     * @sa QAbstractItemModel::rowCount
+     */
+    int rowCount(const QModelIndex &parent = {}) const override;
+
+    /**
+     * @brief Returns a mapping from Role enum values to role names.
+     *
+     * @sa Roles, QAbstractItemModel::roleNames()
+     */
+    QHash<int, QByteArray> roleNames() const override;
+};