Move remaining code to app module

There's still some stuff that could potentially go elsewhere but I think it's enough for now.

src/app/models/notificationsmodel.h

@@ -0,0 +1,68 @@
+// SPDX-FileCopyrightText: 2023 Tobias Fella <tobias.fella@kde.org>
+// SPDX-License-Identifier: LGPL-2.0-or-later
+
+#pragma once
+
+#include "neochatconnection.h"
+#include <QAbstractListModel>
+#include <QPointer>
+#include <QQmlEngine>
+#include <QVariant>
+#include <Quotient/csapi/notifications.h>
+
+class NotificationsModel : public QAbstractListModel
+{
+    Q_OBJECT
+    QML_ELEMENT
+
+    Q_PROPERTY(NeoChatConnection *connection READ connection WRITE setConnection NOTIFY connectionChanged)
+    Q_PROPERTY(bool loading READ loading NOTIFY loadingChanged)
+    Q_PROPERTY(QString nextToken READ nextToken NOTIFY nextTokenChanged)
+
+public:
+    enum Roles {
+        TextRole = Qt::DisplayRole,
+        RoomIdRole,
+        AuthorName,
+        AuthorAvatar,
+        RoomRole,
+        EventIdRole,
+        RoomDisplayNameRole,
+        UriRole,
+    };
+    Q_ENUM(Roles);
+
+    struct Notification {
+        QString roomId;
+        QString text;
+        QString authorName;
+        QUrl authorAvatar;
+        QString eventId;
+        QString roomDisplayName;
+    };
+
+    NotificationsModel(QObject *parent = nullptr);
+
+    int rowCount(const QModelIndex &parent) const override;
+    QVariant data(const QModelIndex &index, int role) const override;
+    QHash<int, QByteArray> roleNames() const override;
+    bool canFetchMore(const QModelIndex &parent) const override;
+    void fetchMore(const QModelIndex &parent) override;
+
+    NeoChatConnection *connection() const;
+    void setConnection(NeoChatConnection *connection);
+    bool loading() const;
+    QString nextToken() const;
+
+Q_SIGNALS:
+    void connectionChanged();
+    void loadingChanged();
+    void nextTokenChanged();
+
+private:
+    QPointer<NeoChatConnection> m_connection;
+    void loadData();
+    QList<Notification> m_notifications;
+    QString m_nextToken;
+    QPointer<Quotient::GetNotificationsJob> m_job;
+};