feat: ambient scene system + unlock-screen banner (reduced-motion aware)

Reusable SceneWidget (QQuickWidget host) loads scene.qml — dusk sky, tiled
grass, running doge, bouncing WOW coins (slowed per feedback), drifting
money — and feeds it Config::reducedMotion so it freezes to a still when
that's set. First placement: a banner atop the unlock form. Scene rendered
& verified at banner + screensaver aspects via local qml6 harness. Assets
from wow-lite-wallet (friend's). Home banner / idle screensaver / per-tab
idle to follow on the same SceneWidget.

src/CMakeLists.txt

@@ -34,7 +34,7 @@ if (CHECK_UPDATES)
     add_subdirectory(openpgp)
 endif()
 
-qt_add_resources(RESOURCES assets.qrc assets_tor.qrc assets_wownerod.qrc assets_docs.qrc mining.qrc silly.qrc)
+qt_add_resources(RESOURCES assets.qrc assets_tor.qrc assets_wownerod.qrc assets_docs.qrc mining.qrc silly.qrc scene.qrc)
 
 # Compile source files (.h/.cpp)
 file(GLOB SOURCE_FILES

src/assets/qml/scene.qml

@@ -0,0 +1,49 @@
+import QtQuick
+
+// wowlet ambient scene — dusk sky, tiled grass, a running doge, bouncing WOW
+// coins, drifting money. All motion gates on `scene.reducedMotion` (exposed by
+// the host SceneBackend); frozen it is the reduced-motion still.
+Rectangle {
+    id: scene
+    property bool reducedMotion: (typeof sceneCtx !== 'undefined' && sceneCtx) ? sceneCtx.reducedMotion : false
+
+    gradient: Gradient {
+        GradientStop { position: 0.0;  color: "#160d2b" }
+        GradientStop { position: 0.5;  color: "#5b2f6e" }
+        GradientStop { position: 0.82; color: "#c96aa0" }
+        GradientStop { position: 1.0;  color: "#f2adc9" }
+    }
+
+    Rectangle { x: parent.width*0.74; y: parent.height*0.14; width: 62; height: 62; radius: 31; color: "#ffe9b0"; opacity: 0.9 }
+
+    AnimatedImage {
+        source: "qrc:/scene/flyingmoney.gif"; playing: !scene.reducedMotion
+        width: 70; height: 64; y: 30; x: 120; opacity: 0.9
+        NumberAnimation on x { running: !scene.reducedMotion; from: -80; to: scene.width; duration: 11000; loops: Animation.Infinite }
+    }
+
+    Row {
+        anchors.bottom: parent.bottom
+        Repeater { model: Math.ceil(scene.width/180)+1
+            Image { source: "qrc:/scene/grass.png"; width: 180; height: 46; smooth: false } }
+    }
+
+    Repeater {
+        model: 3
+        AnimatedImage {
+            source: "qrc:/scene/goldcoin.gif"; playing: !scene.reducedMotion
+            width: 34; height: 34; x: 150 + index*170; y: scene.height*0.46
+            SequentialAnimation on y {
+                running: !scene.reducedMotion; loops: Animation.Infinite
+                NumberAnimation { to: scene.height*0.36; duration: 1050 + index*170; easing.type: Easing.OutQuad }
+                NumberAnimation { to: scene.height*0.5;  duration: 1050 + index*170; easing.type: Easing.InQuad }
+            }
+        }
+    }
+
+    AnimatedImage {
+        source: "qrc:/scene/dog.gif"; playing: !scene.reducedMotion
+        width: 104; height: 83; y: scene.height - 46 - 62; x: 70
+        NumberAnimation on x { running: !scene.reducedMotion; from: -110; to: scene.width; duration: 6500; loops: Animation.Infinite }
+    }
+}

src/scene.qrc

@@ -0,0 +1,10 @@
+<!DOCTYPE RCC><RCC version="1.0">
+  <qresource prefix="/">
+    <file alias="qml/scene.qml">assets/qml/scene.qml</file>
+    <file alias="scene/dog2.gif">assets/images/scene/dog2.gif</file>
+    <file alias="scene/dog.gif">assets/images/scene/dog.gif</file>
+    <file alias="scene/flyingmoney.gif">assets/images/scene/flyingmoney.gif</file>
+    <file alias="scene/goldcoin.gif">assets/images/scene/goldcoin.gif</file>
+    <file alias="scene/grass.png">assets/images/scene/grass.png</file>
+  </qresource>
+</RCC>

src/widgets/SceneWidget.cpp

@@ -0,0 +1,22 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// SPDX-FileCopyrightText: The Monero Project
+
+#include "SceneWidget.h"
+
+#include <QQmlContext>
+
+#include "utils/config.h"
+
+SceneWidget::SceneWidget(QWidget *parent)
+    : QQuickWidget(parent)
+    , m_backend(new SceneBackend(this))
+{
+    m_backend->setReducedMotion(conf()->get(Config::reducedMotion).toBool());
+    this->rootContext()->setContextProperty("sceneCtx", m_backend);
+    this->setResizeMode(QQuickWidget::SizeRootObjectToView);
+    this->setSource(QUrl("qrc:/qml/scene.qml"));
+}
+
+void SceneWidget::refreshReducedMotion() {
+    m_backend->setReducedMotion(conf()->get(Config::reducedMotion).toBool());
+}

src/widgets/SceneWidget.h

@@ -0,0 +1,37 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// SPDX-FileCopyrightText: The Monero Project
+
+#ifndef WOWLET_SCENEWIDGET_H
+#define WOWLET_SCENEWIDGET_H
+
+#include <QObject>
+#include <QQuickWidget>
+
+// Context object exposed to scene.qml as `sceneCtx`. Carries the reduced-motion
+// setting so the scene freezes into its still (reduced-motion) form.
+class SceneBackend : public QObject {
+Q_OBJECT
+    Q_PROPERTY(bool reducedMotion READ reducedMotion NOTIFY reducedMotionChanged)
+public:
+    explicit SceneBackend(QObject *parent = nullptr) : QObject(parent) {}
+    bool reducedMotion() const { return m_reducedMotion; }
+    void setReducedMotion(bool r) { if (m_reducedMotion != r) { m_reducedMotion = r; emit reducedMotionChanged(); } }
+signals:
+    void reducedMotionChanged();
+private:
+    bool m_reducedMotion = false;
+};
+
+// wowlet: reusable ambient-scene surface. Hosts scene.qml and reads the
+// reduced-motion preference from Config. Drop it behind a form, into a banner,
+// or over the window as an idle screensaver.
+class SceneWidget : public QQuickWidget {
+Q_OBJECT
+public:
+    explicit SceneWidget(QWidget *parent = nullptr);
+    void refreshReducedMotion();
+private:
+    SceneBackend *m_backend;
+};
+
+#endif //WOWLET_SCENEWIDGET_H

src/widgets/WalletUnlockWidget.cpp

@@ -9,6 +9,7 @@
 
 #include "utils/Utils.h"
 #include "libwalletqt/Wallet.h"
+#include "widgets/SceneWidget.h"
 
 WalletUnlockWidget::WalletUnlockWidget(QWidget *parent, Wallet *wallet)
         : QWidget(parent)
@@ -18,6 +19,13 @@ WalletUnlockWidget::WalletUnlockWidget(QWidget *parent, Wallet *wallet)
     ui->setupUi(this);
     this->reset();
 
+    // wowlet: ambient scene banner above the unlock form (freezes itself into a
+    // still when "Prefer reduced motion" is set).
+    auto *scene = new SceneWidget(this);
+    scene->setMinimumHeight(120);
+    scene->setMaximumHeight(140);
+    ui->verticalLayout->insertWidget(0, scene);
+
     ui->buttonBox->button(QDialogButtonBox::Ok)->setAutoDefault(true);
 
     connect(ui->buttonBox, &QDialogButtonBox::accepted, this, &WalletUnlockWidget::tryUnlock);