fix: EmailListModel as QAbstractTableModel for proper MailListView display

- Changed EmailListModel from QAbstractListModel to QAbstractTableModel
- Added columnCount() returning 3 columns (Subject, Sender, Date)
- Added headerData() for column headers (Asunto, De, Fecha)
- Modified data() to handle Qt::DisplayRole per column index
- Updated MailListView::setModel() to use column indices instead of role-based column hiding
- Added proper column resize modes (Stretch for Subject/Sender, ResizeToContents for Date)
- Default sort by Date column descending

src/ui/maillistview.cpp

@@ -72,33 +72,17 @@ void MailListView::setupUI() {
 void MailListView::setModel(EmailListModel *model) {
     m_proxyModel->setSourceModel(model);
 
-    m_tableView->setColumnHidden(EmailListModel::IdRole - Qt::UserRole - 1, true);
-    m_tableView->setColumnHidden(EmailListModel::RecipientRole - Qt::UserRole - 1, true);
-    m_tableView->setColumnHidden(EmailListModel::ReadRole - Qt::UserRole - 1, true);
-    m_tableView->setColumnHidden(EmailListModel::FlaggedRole - Qt::UserRole - 1, true);
-    m_tableView->setColumnHidden(EmailListModel::AttachmentsRole - Qt::UserRole - 1, true);
-    m_tableView->setColumnHidden(EmailListModel::FileIdRole - Qt::UserRole - 1, true);
-    m_tableView->setColumnHidden(EmailListModel::SizeRole - Qt::UserRole - 1, true);
-    m_tableView->setColumnHidden(EmailListModel::MessageIdRole - Qt::UserRole - 1, true);
-    m_tableView->setColumnHidden(EmailListModel::SenderInitialRole - Qt::UserRole - 1, true);
+    // Hide columns we don't want to show (by index now, not by role)
+    // Columns: 0=Subject, 1=Sender, 2=Date
+    // All visible for now - we can hide via header data
+    
+    // Default sort by date descending (column 2)
+    m_tableView->sortByColumn(EmailListModel::ColDate, Qt::DescendingOrder);
 
-    m_tableView->horizontalHeader()->setSectionResizeMode(EmailListModel::SenderRole - Qt::UserRole - 1, QHeaderView::Stretch);
-    m_tableView->horizontalHeader()->setSectionResizeMode(EmailListModel::SubjectRole - Qt::UserRole - 1, QHeaderView::Stretch);
-
-    // Default sort by date descending
-    m_tableView->sortByColumn(EmailListModel::DateRole - Qt::UserRole - 1, Qt::DescendingOrder);
-
-    // Set column titles manually
-    QHeaderView *header = m_tableView->horizontalHeader();
-    for (int i = 0; i < m_proxyModel->columnCount(); ++i) {
-        int role = Qt::UserRole + 1 + i;
-        switch (role) {
-            case EmailListModel::SenderRole:   header->setSectionHidden(i, false); break;
-            case EmailListModel::SubjectRole:  header->setSectionHidden(i, false); break;
-            case EmailListModel::DateRole:     header->setSectionHidden(i, false); break;
-            default: header->setSectionHidden(i, true); break;
-        }
-    }
+    // Set column resize modes
+    m_tableView->horizontalHeader()->setSectionResizeMode(EmailListModel::ColSubject, QHeaderView::Stretch);
+    m_tableView->horizontalHeader()->setSectionResizeMode(EmailListModel::ColSender, QHeaderView::Stretch);
+    m_tableView->horizontalHeader()->setSectionResizeMode(EmailListModel::ColDate, QHeaderView::ResizeToContents);
 }
 
 void MailListView::onRowSelected(const QModelIndex &index) {

src/ui/models/EmailListModel.cpp

@@ -3,7 +3,7 @@
 #include <QDateTime>
 
 EmailListModel::EmailListModel(QObject *parent)
-    : QAbstractListModel(parent)
+    : QAbstractTableModel(parent)
 {
     refresh();
 }
@@ -15,6 +15,12 @@ int EmailListModel::rowCount(const QModelIndex &parent) const
     return m_emails.size();
 }
 
+int EmailListModel::columnCount(const QModelIndex &parent) const
+{
+    Q_UNUSED(parent);
+    return ColCount;
+}
+
 QVariant EmailListModel::data(const QModelIndex &index, int role) const
 {
     if (!index.isValid() || index.row() >= m_emails.size())
@@ -23,6 +29,17 @@ QVariant EmailListModel::data(const QModelIndex &index, int role) const
     const MailItem& item = m_emails.at(index.row());
 
     switch (role) {
+    case Qt::DisplayRole:
+    case Qt::EditRole:
+        switch (index.column()) {
+        case ColSubject:
+            return item.subject();
+        case ColSender:
+            return item.sender();
+        case ColDate:
+            return item.date();
+        }
+        break;
     case IdRole:
         return item.id();
     case SubjectRole:
@@ -49,13 +66,29 @@ QVariant EmailListModel::data(const QModelIndex &index, int role) const
         QString sender = item.sender();
         if (sender.isEmpty())
             return QString();
-        // Get first character, or first non-space character?
-        // Simple: first character of the sender string
         return QString(sender.at(0)).toUpper();
     }
     default:
         return QVariant();
     }
+    return QVariant();
+}
+
+QVariant EmailListModel::headerData(int section, Qt::Orientation orientation, int role) const
+{
+    if (orientation != Qt::Horizontal || role != Qt::DisplayRole)
+        return QVariant();
+
+    switch (section) {
+    case ColSubject:
+        return tr("Asunto");
+    case ColSender:
+        return tr("De");
+    case ColDate:
+        return tr("Fecha");
+    default:
+        return QVariant();
+    }
 }
 
 QHash<int, QByteArray> EmailListModel::roleNames() const

src/ui/models/EmailListModel.h

@@ -1,12 +1,12 @@
 #ifndef EMAILLISTMODEL_H
 #define EMAILLISTMODEL_H
 
-#include <QAbstractListModel>
+#include <QAbstractTableModel>
 #include <QHash>
 #include <QByteArray>
 #include "../db/dao/mailitemdao.h"
 
-class EmailListModel : public QAbstractListModel
+class EmailListModel : public QAbstractTableModel
 {
     Q_OBJECT
 public:
@@ -28,8 +28,18 @@ public:
         SenderInitialRole // computed from sender
     };
 
+    // Column indices (match role order for simplicity)
+    enum Columns {
+        ColSubject = 0,
+        ColSender = 1,
+        ColDate = 2,
+        ColCount = 3 // number of visible columns
+    };
+
     int rowCount(const QModelIndex &parent = QModelIndex()) const override;
+    int columnCount(const QModelIndex &parent = QModelIndex()) const override;
     QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;
+    QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const override;
     QHash<int, QByteArray> roleNames() const override;
 
     // Set the folderId to filter emails; -1 means all folders
@@ -40,7 +50,5 @@ public:
 private:
     QVector<MailItem> m_emails;
     int m_folderId{-1}; // -1 means all folders
-    // REMOVED: MailItemDao& m_mailItemDao; // Methods are static, no instance needed
 };
-
 #endif // EMAILLISTMODEL_H