refactor: use proper qt widgets patterns for auth

src/authmanager.cpp

@@ -31,7 +31,7 @@ AuthManager::AuthManager(QObject *parent)
   });
 }
 
-void AuthManager::init()
+void AuthManager::tryRestoreSession()
 {
   QString storageSessionToken = m_settings->value(key).toString();
   if (storageSessionToken.isEmpty())
@@ -90,6 +90,15 @@ void AuthManager::setIsSignedIn(bool newValue)
 
   m_isSignedIn = newValue;
   emit isSignedInChanged();
+
+  if (m_isSignedIn)
+  {
+    emit signedIn();
+  }
+  else
+  {
+    emit signedOut();
+  }
 }
 
 bool AuthManager::isSignedIn() const
@@ -162,6 +171,7 @@ void AuthManager::signIn(const QString &code)
     if (jsonDoc.isNull())
     {
       qWarning() << "Failed to create a JSON doc.";
+      emit errorOccurred("Unable to verify code");
       return;
     }