Create a new module for the room info drawer QML.

Create a new module for the room info drawer QML. This also requires moving some QML to LibNeoChat common with other modules. Finally all QML in roominfo is modifed to not depend on app.

src/roominfo/RoomPinnedMessagesPage.qml

@@ -0,0 +1,64 @@
+// SPDX-FileCopyrightText: 2025 Joshua Goins <josh@redstrate.com>
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+import QtQuick
+import QtQuick.Layouts
+
+import org.kde.kirigami as Kirigami
+
+import org.kde.neochat.libneochat
+import org.kde.neochat.timeline
+
+/**
+ * @brief Component for showing the pinned messages in a room.
+ */
+Kirigami.ScrollablePage {
+    id: root
+
+    /**
+     * @brief The room to show the pinned messages for.
+     */
+    required property NeoChatRoom room
+
+    title: i18nc("@title", "Pinned Messages")
+
+    Kirigami.Theme.colorSet: Kirigami.Theme.Window
+    Kirigami.Theme.inherit: false
+
+    ListView {
+        id: listView
+        spacing: 0
+
+        model: PinnedMessageModel {
+            id: pinModel
+            room: root.room
+        }
+
+        delegate: EventDelegate {
+            room: root.room
+        }
+
+        section.property: "section"
+
+        Kirigami.PlaceholderMessage {
+            icon.name: "pin-symbolic"
+            anchors.centerIn: parent
+            text: i18nc("@info:placeholder", "No Pinned Messages")
+            visible: listView.count === 0
+        }
+
+        Kirigami.LoadingPlaceholder {
+            anchors.centerIn: parent
+            visible: listView.count === 0 && pinModel.loading
+        }
+
+        Keys.onUpPressed: {
+            if (listView.currentIndex > 0) {
+                listView.decrementCurrentIndex();
+            } else {
+                listView.currentIndex = -1; // This is so the list view doesn't appear to have two selected items
+                listView.headerItem.forceActiveFocus(Qt.TabFocusReason);
+            }
+        }
+    }
+}