feat: add colours page placeholder

modules/nexus/PageCompRegistry.qml

@@ -21,6 +21,9 @@ QtObject {
                 Component {
                     WallpaperCategory {}
                 }
+                Component {
+                    ColourSelect {}
+                }
             }
         }
     ]

modules/nexus/pages/WallpaperAndStyle.qml

@@ -166,7 +166,7 @@ PageBase {
                 type: IconTextButton.Tonal
                 horizontalPadding: Tokens.padding.extraLarge
                 verticalPadding: Tokens.padding.medium
-                onClicked: ; // TODO
+                onClicked: root.nState.openSubPage(3) // Colours page
             }
         }
 

modules/nexus/pages/wallandstyle/ColourSelect.qml

@@ -0,0 +1,47 @@
+import QtQuick
+import QtQuick.Layouts
+import Caelestia.Config
+import qs.components
+import qs.services
+import qs.modules.nexus.common
+
+PageBase {
+    id: root
+
+    title: qsTr("Colours")
+    isSubPage: true
+
+    Item {
+        anchors.horizontalCenter: parent.horizontalCenter
+        implicitHeight: {
+            const f = parent.parent as Flickable;
+            return f.height - f.topMargin - f.bottomMargin;
+        }
+
+        ColumnLayout {
+            anchors.centerIn: parent
+            spacing: Tokens.padding.extraSmall
+
+            MaterialIcon {
+                Layout.alignment: Qt.AlignHCenter
+                text: "handyman"
+                color: Colours.palette.m3outlineVariant
+                font: Tokens.font.icon.extraLarge
+            }
+
+            StyledText {
+                Layout.alignment: Qt.AlignHCenter
+                text: qsTr("Page under construction")
+                color: Colours.palette.m3outlineVariant
+                font: Tokens.font.title.large
+            }
+
+            StyledText {
+                Layout.alignment: Qt.AlignHCenter
+                text: qsTr("This page will be available in a future update.")
+                color: Colours.palette.m3outlineVariant
+                font: Tokens.font.body.large
+            }
+        }
+    }
+}