Improve DevicesPage and DevicesModel

- Split the list into sections for "this devices", "verified devices", "unverified devices", and "devices without encryption support"
- Sort the lists by last activity

src/models/devicesproxymodel.cpp

@@ -0,0 +1,28 @@
+// SPDX-FileCopyrightText: 2023 Tobias Fella <tobias.fella@kde.org>
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "devicesproxymodel.h"
+#include "devicesmodel.h"
+
+int DevicesProxyModel::type() const
+{
+    return m_type;
+}
+void DevicesProxyModel::setType(int type)
+{
+    m_type = type;
+    Q_EMIT typeChanged();
+}
+
+bool DevicesProxyModel::filterAcceptsRow(int source_row, const QModelIndex &source_parent) const
+{
+    Q_UNUSED(source_parent)
+    return sourceModel()->data(sourceModel()->index(source_row, 0), DevicesModel::Type).toInt() == m_type;
+}
+DevicesProxyModel::DevicesProxyModel(QObject *parent)
+    : QSortFilterProxyModel(parent)
+    , m_type(0)
+{
+    setSortRole(DevicesModel::LastTimestamp);
+    sort(0, Qt::DescendingOrder);
+}