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/qml/HoverLinkIndicator.qml

@@ -0,0 +1,31 @@
+// SPDX-FileCopyrightText: 2024 Tobias Fella <tobias.fella@kde.org>
+// SPDX-FileCopyrightText: 2024 Carl Schwan <carl@carlschwan.eu>
+// SPDX-License-Identifier: LGPL-2.0-or-later
+
+import QtQuick
+import QtQuick.Controls as QQC2
+
+import org.kde.kirigami as Kirigami
+
+QQC2.Control {
+    id: root
+
+    property string text
+
+    visible: !root.text.startsWith("https://matrix.to/") && root.text.length > 0
+    Kirigami.Theme.colorSet: Kirigami.Theme.View
+
+    z: 20
+
+    Accessible.ignored: true
+
+    contentItem: QQC2.Label {
+        text: root.text.startsWith("https://matrix.to/") ? "" : root.text
+        elide: Text.ElideRight
+        Accessible.description: i18nc("@info screenreader", "The currently selected link")
+    }
+
+    background: Rectangle {
+        color: Kirigami.Theme.backgroundColor
+    }
+}