feat: ambient silliness across the app (reduced-motion aware)

- Lock screen: full ambient scene above the unlock form (the idle 'screensaver'
  — wallet auto-locks here) instead of a thin banner.
- History ('home'): full scene as a top banner.
- Send/Receive: IdleDoge — a small click-through sitting doge in the corner,
  the 'most quiet' idle for task screens.
- Mining keeps its own scene.
All gated by Config::reducedMotion (scenes freeze, doge shows a still frame).

src/HistoryWidget.cpp

@@ -14,6 +14,7 @@
 #include "utils/config.h"
 #include "utils/Icons.h"
 #include "WebsocketNotifier.h"
+#include "widgets/SceneWidget.h"
 
 HistoryWidget::HistoryWidget(Wallet *wallet, QWidget *parent)
         : QWidget(parent)
@@ -24,6 +25,13 @@ HistoryWidget::HistoryWidget(Wallet *wallet, QWidget *parent)
         , m_model(wallet->historyModel())
 {
     ui->setupUi(this);
+
+    // wowlet: History is "home" — the full ambient scene as a top banner.
+    auto *scene = new SceneWidget(this);
+    scene->setMinimumHeight(120);
+    scene->setMaximumHeight(150);
+    ui->verticalLayout->insertWidget(0, scene);
+
     m_contextMenu->addMenu(m_copyMenu);
     m_contextMenu->addAction(icons()->icon("info2.svg"), "Show details", this, &HistoryWidget::showTxDetails);
     m_contextMenu->addAction("View on block explorer", this, &HistoryWidget::onViewOnBlockExplorer);

src/ReceiveWidget.cpp

@@ -12,6 +12,7 @@
 #include "utils/config.h"
 #include "utils/Icons.h"
 #include "utils/Utils.h"
+#include "widgets/IdleDoge.h"
 
 ReceiveWidget::ReceiveWidget(Wallet *wallet, QWidget *parent)
         : QWidget(parent)
@@ -20,6 +21,8 @@ ReceiveWidget::ReceiveWidget(Wallet *wallet, QWidget *parent)
 {
     ui->setupUi(this);
 
+    new IdleDoge(this);   // wowlet: whisper-quiet corner critter (freezes when reduced-motion)
+
     m_model = m_wallet->subaddressModel();
     m_proxyModel = new SubaddressProxyModel(this, m_wallet->subaddress());
     m_proxyModel->setSourceModel(m_model);

src/SendWidget.cpp

@@ -11,6 +11,7 @@
 #include "Icons.h"
 #include "libwalletqt/Wallet.h"
 #include "libwalletqt/WalletManager.h"
+#include "widgets/IdleDoge.h"
 
 #if defined(WITH_SCANNER)
 #include "wizard/offline_tx_signing/OfflineTxSigningWizard.h"
@@ -25,6 +26,8 @@ SendWidget::SendWidget(Wallet *wallet, QWidget *parent)
 {
     ui->setupUi(this);
 
+    new IdleDoge(this);   // wowlet: whisper-quiet corner critter (freezes when reduced-motion)
+
     QString amount_rx = R"(^\d{0,8}[\.,]\d{0,12}|(all)$)";
     QRegularExpression rx;
     rx.setPattern(amount_rx);

src/widgets/IdleDoge.cpp

@@ -0,0 +1,46 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// SPDX-FileCopyrightText: The Monero Project
+
+#include "IdleDoge.h"
+
+#include <QEvent>
+#include <QMovie>
+
+#include "utils/config.h"
+
+IdleDoge::IdleDoge(QWidget *parent, int height)
+    : QLabel(parent)
+    , m_movie(new QMovie(":/assets/images/dog_sitting.gif", QByteArray(), this))
+{
+    m_movie->jumpToFrame(0);
+    const QSize frame = m_movie->currentImage().size();
+    if (frame.height() > 0)
+        m_movie->setScaledSize(QSize(frame.width() * height / frame.height(), height));
+    this->setMovie(m_movie);
+    this->setAttribute(Qt::WA_TransparentForMouseEvents);   // never block the form
+    this->adjustSize();
+
+    if (conf()->get(Config::reducedMotion).toBool())
+        m_movie->jumpToFrame(0);   // still frame
+    else
+        m_movie->start();
+
+    if (parent) {
+        parent->installEventFilter(this);
+        this->reposition();
+        this->raise();
+    }
+}
+
+void IdleDoge::reposition() {
+    if (auto *p = parentWidget())
+        this->move(p->width() - this->width() - 14, p->height() - this->height() - 14);
+}
+
+bool IdleDoge::eventFilter(QObject *o, QEvent *e) {
+    if (o == parentWidget() && (e->type() == QEvent::Resize || e->type() == QEvent::Show)) {
+        this->reposition();
+        this->raise();
+    }
+    return QLabel::eventFilter(o, e);
+}

src/widgets/IdleDoge.h

@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// SPDX-FileCopyrightText: The Monero Project
+
+#ifndef WOWLET_IDLEDOGE_H
+#define WOWLET_IDLEDOGE_H
+
+#include <QLabel>
+
+class QMovie;
+
+// wowlet: a small sitting doge that floats, click-through, in the bottom-right
+// corner of its parent — the "most quiet" ambient idle for task screens (Send,
+// Receive). Freezes to a still frame when "Prefer reduced motion" is set.
+class IdleDoge : public QLabel {
+Q_OBJECT
+public:
+    explicit IdleDoge(QWidget *parent, int height = 44);
+protected:
+    bool eventFilter(QObject *o, QEvent *e) override;
+private:
+    void reposition();
+    QMovie *m_movie;
+};
+
+#endif //WOWLET_IDLEDOGE_H

src/widgets/WalletUnlockWidget.cpp

@@ -19,12 +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
+    // wowlet: the lock screen shows the full ambient scene above the unlock form
-    // still when "Prefer reduced motion" is set).
+    // (this is the idle "screensaver" — the wallet auto-locks here on inactivity).
+    // It freezes into a still when "Prefer reduced motion" is set.
     auto *scene = new SceneWidget(this);
-    scene->setMinimumHeight(120);
+    scene->setMinimumHeight(200);
-    scene->setMaximumHeight(140);
+    scene->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
-    ui->verticalLayout->insertWidget(0, scene);
+    ui->verticalLayout->insertWidget(0, scene, 1);
 
     ui->buttonBox->button(QDialogButtonBox::Ok)->setAutoDefault(true);