fix: fetch emails when folder is selected in tree view

src/ui/mainmainwindow.cpp

@@ -2,6 +2,9 @@
 #include "core/models/account.h"
 #include "core/mailitem.h"
 #include "db/dao/mailitemdao.h"
+#include "db/dao/folderdao.h"
+#include <optional>
+#include <QMessageBox>
 #include "ui/accountsetupdialog.h"
 #include <QVBoxLayout>
 #include <QHBoxLayout>
@@ -223,6 +226,16 @@ void MainMainWindow::onFolderSelected(const QModelIndex &index) {
     if (itemType == FolderTreeItem::FolderNode) {
         m_currentFolderId = index.data(FolderListModel::FolderIdRole).toInt();
         m_emailModel->setFolderId(m_currentFolderId);
+        // Fetch mails for this folder
+        std::optional<Folder> optFolder = FolderDao::findById(m_currentFolderId);
+        if (optFolder.has_value()) {
+            Folder folder = optFolder.value();
+            Account* account = m_accountService->findAccountById(folder.accountId());
+            if (account) {
+                m_mailService->fetchMails(QString::number(account->id()), QString::number(m_currentFolderId));
+                delete account;
+            }
+        }
         m_emailModel->refresh();
     }
 }