projection: begin the exact-path public epoch

The public tree and its history contain only the listed paths. Earlier projection history remains preserved internally.

Source-Sha: 913fde029b935671833254797f0f20f1eb9fabba

Policy-Sha: 913fde029b935671833254797f0f20f1eb9fabba

Tree-Digest: 180ae530c1058a2a5c89837bdce2d323ae83e669e38590ca72e75b8d92b7262f

desktop/qml/PageHeader.qml

@@ -0,0 +1,47 @@
+import QtQuick
+import QtQuick.Layouts
+
+GridLayout {
+    id: root
+
+    property string title
+    property string subtitle
+    default property alias actions: actionsRow.data
+
+    columns: width < 850 ? 1 : 2
+    columnSpacing: 20
+    rowSpacing: 12
+
+    ColumnLayout {
+        Layout.fillWidth: true
+        Layout.minimumWidth: 0
+        spacing: 6
+
+        Text {
+            Layout.fillWidth: true
+            text: root.title
+            color: Theme.text
+            font.pixelSize: Theme.fontTitle
+            font.weight: Font.Bold
+            wrapMode: Text.Wrap
+        }
+
+        Text {
+            Layout.fillWidth: true
+            text: root.subtitle
+            color: Theme.dim
+            font.pixelSize: Theme.fontBody
+            wrapMode: Text.Wrap
+        }
+
+    }
+
+    RowLayout {
+        id: actionsRow
+
+        Layout.fillWidth: root.columns === 1
+        Layout.maximumWidth: root.width
+        spacing: 8
+    }
+
+}