Add the "HA Dashboard" tab with HA's web UI (DSH-1)

A second dashboard surface shows a WebEngineView at homeassistant.url, or
a hint when none is set. HaWebUi (QML singleton owned by Dashboard) holds
the URL and a persistent WebEngine profile under
~/.local/share/frameassistant/webengine so the HA login survives restarts.
QtWebEngineQuick::initialize() runs in main() before the app object (D39).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/CMakeLists.txt

@@ -58,14 +58,20 @@ target_link_libraries(frameassistant_lib PUBLIC Qt6::Core)
 target_compile_options(frameassistant_lib PRIVATE -Wall -Wextra)
 
 # The app: its UI is the QML module "FrameAssistant" (src/qml/).
+# Qt WebEngine shows HA's web UI (DSH-1); on the Frame it comes with the system Qt.
+find_package(Qt6 REQUIRED COMPONENTS WebEngineQuick)
 vrdash_add_dashboard(frameassistant
     OUTPUT_NAME ${VRDASH_EXECUTABLE_NAME}
     QML_URI FrameAssistant
     SOURCES main.cpp Dashboard.h Dashboard.cpp
+    QML_SOURCES ha/HaWebUi.h ha/HaWebUi.cpp
     QML_FILES
         qml/Main.qml
-        qml/Card.qml)
-target_link_libraries(frameassistant PRIVATE frameassistant_lib)
+        qml/Card.qml
+        qml/HaDashboard.qml)
+target_link_libraries(frameassistant PRIVATE frameassistant_lib Qt6::WebEngineQuick)
+# The generated QML type registration includes QML_SOURCES headers by file name.
+target_include_directories(frameassistant PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/ha)
 
 install(FILES ${OPENVR_LIBRARY} DESTINATION ${CMAKE_INSTALL_LIBDIR})
 

src/Dashboard.cpp

@@ -17,6 +17,9 @@ Dashboard::Dashboard(int& argc, char** argv)
                                   .arg(Config::defaultPath()),
                               QStringLiteral("path"))}) {
   addSurface({.qmlRootType = QStringLiteral("Main")});
+  addSurface({.id = QStringLiteral("dashboard"),
+              .qmlRootType = QStringLiteral("HaDashboard"),
+              .displayName = QStringLiteral("HA Dashboard")});
 }
 
 bool Dashboard::prepare(QString* error) {
@@ -34,3 +37,5 @@ bool Dashboard::prepare(QString* error) {
                     << m_config.deviceName << "(" + m_config.deviceId + ")";
   return true;
 }
+
+void Dashboard::loading() { m_haWebUi.setUrl(m_config.haUrl); }

src/Dashboard.h

@@ -2,6 +2,7 @@
 
 #include "app/DashboardApplication.h"
 #include "config/Config.h"
+#include "ha/HaWebUi.h"
 
 // The dashboard app. Its UI is the QML module set up in src/CMakeLists.txt
 // (QML_URI FrameAssistant, files in src/qml/).
@@ -16,7 +17,10 @@ class Dashboard : public DashboardApplication {
  protected:
   // Loads the settings (overlay and desktop mode; docs/DESIGN.md, D22).
   bool prepare(QString* error) override;
+  void loading() override;
 
  private:
   Config m_config;
+  // QML singleton (HaWebUi); a member, so it outlives all QML.
+  HaWebUi m_haWebUi{nullptr};
 };

src/ha/HaWebUi.cpp

@@ -0,0 +1,49 @@
+#include "ha/HaWebUi.h"
+
+#include <QQmlEngine>
+#include <QQuickWebEngineProfile>
+#include <QStandardPaths>
+
+namespace {
+
+HaWebUi* g_instance = nullptr;
+
+}  // namespace
+
+HaWebUi::HaWebUi(QObject* parent) : QObject(parent) {
+  Q_ASSERT(!g_instance);
+  g_instance = this;
+}
+
+HaWebUi::~HaWebUi() { g_instance = nullptr; }
+
+QQuickWebEngineProfile* HaWebUi::profile() {
+  if (!m_profile) {
+    m_profile = new QQuickWebEngineProfile(this);
+    m_profile->setStorageName(QStringLiteral("frameassistant"));
+    m_profile->setOffTheRecord(false);
+    m_profile->setPersistentStoragePath(storagePath());
+    m_profile->setCachePath(cachePath());
+    m_profile->setPersistentCookiesPolicy(
+        QQuickWebEngineProfile::AllowPersistentCookies);
+  }
+  return m_profile;
+}
+
+QString HaWebUi::storagePath() {
+  return QStandardPaths::writableLocation(QStandardPaths::GenericDataLocation) +
+         QStringLiteral("/frameassistant/webengine");
+}
+
+QString HaWebUi::cachePath() {
+  return QStandardPaths::writableLocation(
+             QStandardPaths::GenericCacheLocation) +
+         QStringLiteral("/frameassistant/webengine");
+}
+
+HaWebUi* HaWebUi::create(QQmlEngine*, QJSEngine*) {
+  Q_ASSERT(g_instance);
+  // Owned by the app, not by the QML engine.
+  QJSEngine::setObjectOwnership(g_instance, QJSEngine::CppOwnership);
+  return g_instance;
+}

src/ha/HaWebUi.h

@@ -0,0 +1,46 @@
+#pragma once
+
+#include <QtQml/qqmlregistration.h>
+
+#include <QObject>
+#include <QQuickWebEngineProfile>
+#include <QUrl>
+
+class QJSEngine;
+class QQmlEngine;
+
+// HA's web UI in the "HA Dashboard" tab (DSH-1): the URL from the settings
+// and a persistent WebEngine profile, so the HA login survives restarts
+// (docs/DESIGN.md, D39). A QML singleton owned by the app (Dashboard).
+class HaWebUi : public QObject {
+  Q_OBJECT
+  QML_ELEMENT
+  QML_SINGLETON
+  // Empty: no URL configured (the tab shows a hint).
+  Q_PROPERTY(QUrl url READ url CONSTANT)
+  Q_PROPERTY(QQuickWebEngineProfile* profile READ profile CONSTANT)
+
+ public:
+  // Not default-constructible, so QML uses create() instead of making its
+  // own instance.
+  explicit HaWebUi(QObject* parent);
+  ~HaWebUi() override;
+
+  // Call before the QML is loaded.
+  void setUrl(const QUrl& url) { m_url = url; }
+
+  QUrl url() const { return m_url; }
+  // Created on first use: only a tab that shows the web UI needs it.
+  QQuickWebEngineProfile* profile();
+
+  // Where the profile keeps its data (cookies, local storage) and cache.
+  static QString storagePath();
+  static QString cachePath();
+
+  // QML singleton factory: the instance the app created.
+  static HaWebUi* create(QQmlEngine*, QJSEngine*);
+
+ private:
+  QUrl m_url;
+  QQuickWebEngineProfile* m_profile = nullptr;
+};

src/main.cpp

@@ -1,6 +1,11 @@
+#include <QtWebEngineQuick/qtwebenginequickglobal.h>
+
 #include "Dashboard.h"
 
 int main(int argc, char* argv[]) {
+  // Must run before the Qt application object exists (the Dashboard
+  // constructor creates it).
+  QtWebEngineQuick::initialize();
   Dashboard app(argc, argv);
   return app.exec();
 }

src/qml/HaDashboard.qml

@@ -0,0 +1,40 @@
+import QtQuick
+import QtQuick.Controls
+import QtQuick.Controls.Material
+import QtWebEngine
+
+// "HA Dashboard" tab (DSH-1): HA's own web UI at the URL from the settings.
+// Without a URL it shows a hint instead.
+Pane {
+    id: root
+
+    Material.theme: Material.Dark
+    padding: 0
+    font.pixelSize: 24
+
+    Loader {
+        anchors.fill: parent
+        sourceComponent: HaWebUi.url.toString() !== "" ? webUi : hint
+    }
+
+    Component {
+        id: webUi
+
+        WebEngineView {
+            profile: HaWebUi.profile
+            url: HaWebUi.url
+        }
+    }
+
+    Component {
+        id: hint
+
+        Label {
+            padding: 48
+            wrapMode: Text.WordWrap
+            verticalAlignment: Text.AlignVCenter
+            horizontalAlignment: Text.AlignHCenter
+            text: qsTr("No Home Assistant URL configured.\n\nSet \"homeassistant.url\" in the settings file and restart.")
+        }
+    }
+}