feat(send,receive): the ambient scene, as a layout item this time

Send had a large empty region under the form doing nothing, and Receive had
nothing at all. Both get the scene back — but as real layout items, not as the
overlay that painted over the forms last time.

Send: the form only ever needed the top of the tab, so the QFormLayout is now
wrapped in a vbox and the scene takes the rest. The widget's vertical size
policy was Maximum, which made it hug the form; it owns the whole tab now. The
form itself is untouched, and nothing is drawn on top of the address or amount
fields.

Receive: a short banner under the address table.

Built and smoke-tested from the AppImage lane.

src/ReceiveWidget.cpp

@@ -12,6 +12,7 @@
 #include "utils/config.h"
 #include "utils/Icons.h"
 #include "utils/Utils.h"
+#include "widgets/SceneWidget.h"
 
 ReceiveWidget::ReceiveWidget(Wallet *wallet, QWidget *parent)
         : QWidget(parent)
@@ -20,6 +21,13 @@ ReceiveWidget::ReceiveWidget(Wallet *wallet, QWidget *parent)
 {
     ui->setupUi(this);
 
+    // wowlet: ambient scene as a short banner under the address table. A layout
+    // item, never an overlay over the table.
+    auto *scene = new SceneWidget(this);
+    scene->setMinimumHeight(110);
+    scene->setMaximumHeight(130);
+    ui->verticalLayout->addWidget(scene);
+
     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/SceneWidget.h"
 
 #if defined(WITH_SCANNER)
 #include "wizard/offline_tx_signing/OfflineTxSigningWizard.h"
@@ -25,6 +26,14 @@ SendWidget::SendWidget(Wallet *wallet, QWidget *parent)
 {
     ui->setupUi(this);
 
+    // wowlet: the form only needs the top of the tab — give the rest of it to
+    // the ambient scene. A layout item under the form, never an overlay: the
+    // send form itself stays untouched.
+    auto *scene = new SceneWidget(this);
+    scene->setMinimumHeight(160);
+    scene->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
+    ui->verticalLayoutOuter->addWidget(scene, 1);
+
     QString amount_rx = R"(^\d{0,8}[\.,]\d{0,12}|(all)$)";
     QRegularExpression rx;
     rx.setPattern(amount_rx);

src/SendWidget.ui

@@ -11,7 +11,7 @@
    </rect>
   </property>
   <property name="sizePolicy">
-   <sizepolicy hsizetype="Preferred" vsizetype="Maximum">
+   <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
     <horstretch>0</horstretch>
     <verstretch>0</verstretch>
    </sizepolicy>
@@ -19,7 +19,24 @@
   <property name="windowTitle">
    <string>Form</string>
   </property>
-  <layout class="QFormLayout" name="formLayout">
+  <layout class="QVBoxLayout" name="verticalLayoutOuter">
+   <property name="spacing">
+    <number>0</number>
+   </property>
+   <property name="leftMargin">
+    <number>0</number>
+   </property>
+   <property name="topMargin">
+    <number>0</number>
+   </property>
+   <property name="rightMargin">
+    <number>0</number>
+   </property>
+   <property name="bottomMargin">
+    <number>0</number>
+   </property>
+   <item>
+    <layout class="QFormLayout" name="formLayout">
    <property name="sizeConstraint">
     <enum>QLayout::SizeConstraint::SetMinimumSize</enum>
    </property>
@@ -274,6 +291,8 @@
      </item>
     </widget>
    </item>
+    </layout>
+   </item>
   </layout>
  </widget>
  <customwidgets>