Fix build: synchronize Request API, fix GmailSynchronizer, and migrate UI to Qt6 Widgets

src/concreterequests.cpp

@@ -0,0 +1,18 @@
+// concreterequests.cpp
+#include "concreterequests.h"
+#include <QDebug>
+
+Request* Concreterequests::createRequest(const QString& type, const QString& target) {
+    qDebug() << "Attempting to create request type:" << type << "for target:" << target;
+
+    if (type == "IMAP") {
+        // Placeholder for IMAP request creation
+        return new ImapRequest(nullptr); // Will be properly initialized by the concrete class
+    } else if (type == "SMTP") {
+        // Placeholder for SMTP request creation
+        return new SmtpRequest(nullptr); // Will be properly initialized by the concrete class
+    }
+
+    qWarning() << "Unknown request type:" << type;
+    return nullptr;
+}