Advance Phase 5: added EmailManager, updated main.cpp, improved ReaderPage placeholder, added ComposePage form

src/core/emailmanager.cpp

@@ -0,0 +1,32 @@
+#include "EmailManager.h"
+#include <QDir>
+#include <QStandardPaths>
+#include "../db/dao/mailitemdao.h"
+
+EmailManager::EmailManager(QObject *parent)
+    : QObject(parent)
+{
+}
+
+MailItem EmailManager::getMailItemById(qint64 id) const
+{
+    // Use the DAO to fetch the MailItem by id
+    auto optItem = MailItemDao::instance().findById(id);
+    if (optItem.has_value()) {
+        return optItem.value();
+    }
+    // Return an empty MailItem if not found
+    return MailItem();
+}
+
+QString EmailManager::getStorageDirectory() const
+{
+    // Define where .eml files are stored (e.g., in the application data directory)
+    QString storagePath = QStandardPaths::writableLocation(QStandardPaths::AppDataLocation);
+    QDir dir(storagePath);
+    if (!dir.exists()) {
+        dir.mkpath("."); // create if it doesn't exist
+    }
+    // Assuming .eml files are stored directly in this directory
+    return storagePath;
+}