feat: Pinned emails support (flag/follow-up)

- EmailListModel: new m_pinnedOnly filter + setShowPinnedOnly()
- EmailListModel/EmailListModel.cpp: passes pinnedOnly to paginated queries
- MailItemDao: countAll, countByFolderId, findAllPaginated, findByFolderIdPaginated accept pinnedOnly
- MailListView: new 'Solo fijados' checkbox in filter bar
- CompactMailDelegate: orange pushpin indicator (top-right) for pinned emails
- Works in both tree view and compact card view
- Pinned indicator uses QPainterPath for pushpin shape (orange)

build/CMakeFiles/wino-mail-qt.dir/src/ui/delegates/CompactMailDelegate.cpp.o.d

@@ -555,4 +555,6 @@ CMakeFiles/wino-mail-qt.dir/src/ui/delegates/CompactMailDelegate.cpp.o: \
  /usr/include/x86_64-linux-gnu/qt6/QtCore/QDebug \
  /usr/include/x86_64-linux-gnu/qt6/QtCore/qdebug.h \
  /usr/include/x86_64-linux-gnu/qt6/QtGui/QCursor \
- /usr/include/x86_64-linux-gnu/qt6/QtGui/qcursor.h
+ /usr/include/x86_64-linux-gnu/qt6/QtGui/qcursor.h \
+ /usr/include/x86_64-linux-gnu/qt6/QtGui/QPainterPath \
+ /usr/include/x86_64-linux-gnu/qt6/QtGui/qpainterpath.h

src/db/dao/mailitemdao.cpp

@@ -438,7 +438,7 @@ int MailItemDao::countUnreadByFolderId(int folderId)
     return 0;
 }
 
-int MailItemDao::countAll(const QString& searchFilter, bool unreadOnly, bool flaggedOnly, bool hasAttachments)
+int MailItemDao::countAll(const QString& searchFilter, bool unreadOnly, bool flaggedOnly, bool hasAttachments, bool pinnedOnly)
 {
     QSqlDatabase db = DatabaseManager::instance().database();
     QString sql = "SELECT COUNT(*) FROM MailCopy WHERE 1=1";
@@ -457,6 +457,9 @@ int MailItemDao::countAll(const QString& searchFilter, bool unreadOnly, bool fla
     if (hasAttachments) {
         sql += " AND hasAttachment = 1";
     }
+    if (pinnedOnly) {
+        sql += " AND isPinned = 1";
+    }
 
     query.prepare(sql);
     if (!query.exec()) {
@@ -469,7 +472,7 @@ int MailItemDao::countAll(const QString& searchFilter, bool unreadOnly, bool fla
     return 0;
 }
 
-int MailItemDao::countByFolderId(int folderId, const QString& searchFilter, bool unreadOnly, bool flaggedOnly, bool hasAttachments)
+int MailItemDao::countByFolderId(int folderId, const QString& searchFilter, bool unreadOnly, bool flaggedOnly, bool hasAttachments, bool pinnedOnly)
 {
     QSqlDatabase db = DatabaseManager::instance().database();
     QString sql = "SELECT COUNT(*) FROM MailCopy WHERE folderId = :folderId";
@@ -489,6 +492,9 @@ int MailItemDao::countByFolderId(int folderId, const QString& searchFilter, bool
     if (hasAttachments) {
         sql += " AND hasAttachment = 1";
     }
+    if (pinnedOnly) {
+        sql += " AND isPinned = 1";
+    }
 
     query.prepare(sql);
     if (!query.exec()) {
@@ -501,7 +507,7 @@ int MailItemDao::countByFolderId(int folderId, const QString& searchFilter, bool
     return 0;
 }
 
-QVector<MailItem> MailItemDao::findAllPaginated(int offset, int limit, const QString& searchFilter, bool unreadOnly, bool flaggedOnly, bool hasAttachments)
+QVector<MailItem> MailItemDao::findAllPaginated(int offset, int limit, const QString& searchFilter, bool unreadOnly, bool flaggedOnly, bool hasAttachments, bool pinnedOnly)
 {
     QVector<MailItem> items;
     QSqlDatabase db = DatabaseManager::instance().database();
@@ -519,6 +525,9 @@ QVector<MailItem> MailItemDao::findAllPaginated(int offset, int limit, const QSt
     if (hasAttachments) {
         sql += " AND hasAttachment = 1";
     }
+    if (pinnedOnly) {
+        sql += " AND isPinned = 1";
+    }
 
     sql += " ORDER BY date DESC LIMIT :limit OFFSET :offset";
 
@@ -567,7 +576,7 @@ QVector<MailItem> MailItemDao::findAllPaginated(int offset, int limit, const QSt
     return items;
 }
 
-QVector<MailItem> MailItemDao::findByFolderIdPaginated(int folderId, int offset, int limit, const QString& searchFilter, bool unreadOnly, bool flaggedOnly, bool hasAttachments)
+QVector<MailItem> MailItemDao::findByFolderIdPaginated(int folderId, int offset, int limit, const QString& searchFilter, bool unreadOnly, bool flaggedOnly, bool hasAttachments, bool pinnedOnly)
 {
     QVector<MailItem> items;
     QSqlDatabase db = DatabaseManager::instance().database();
@@ -588,6 +597,9 @@ QVector<MailItem> MailItemDao::findByFolderIdPaginated(int folderId, int offset,
     if (hasAttachments) {
         sql += " AND hasAttachment = 1";
     }
+    if (pinnedOnly) {
+        sql += " AND isPinned = 1";
+    }
 
     sql += " ORDER BY date DESC LIMIT :limit OFFSET :offset";
 

src/db/dao/mailitemdao.h

@@ -33,8 +33,8 @@ public:
     static bool replaceAttachments(qint64 mailItemId, const QVector<StoredAttachmentRecord>& attachments);
     static QVector<StoredAttachmentRecord> attachmentsForMail(qint64 mailItemId);
     static int countUnreadByFolderId(int folderId);
-    static int countAll(const QString& searchFilter, bool unreadOnly, bool flaggedOnly, bool hasAttachments);
-    static int countByFolderId(int folderId, const QString& searchFilter, bool unreadOnly, bool flaggedOnly, bool hasAttachments);
-    static QVector<MailItem> findAllPaginated(int offset, int limit, const QString& searchFilter, bool unreadOnly, bool flaggedOnly, bool hasAttachments);
-    static QVector<MailItem> findByFolderIdPaginated(int folderId, int offset, int limit, const QString& searchFilter, bool unreadOnly, bool flaggedOnly, bool hasAttachments);
+    static int countAll(const QString& searchFilter, bool unreadOnly, bool flaggedOnly, bool hasAttachments, bool pinnedOnly);
+    static int countByFolderId(int folderId, const QString& searchFilter, bool unreadOnly, bool flaggedOnly, bool hasAttachments, bool pinnedOnly);
+    static QVector<MailItem> findAllPaginated(int offset, int limit, const QString& searchFilter, bool unreadOnly, bool flaggedOnly, bool hasAttachments, bool pinnedOnly);
+    static QVector<MailItem> findByFolderIdPaginated(int folderId, int offset, int limit, const QString& searchFilter, bool unreadOnly, bool flaggedOnly, bool hasAttachments, bool pinnedOnly);
 };

src/ui/delegates/CompactMailDelegate.cpp

@@ -2,6 +2,7 @@
 #include <QDebug>
 #include <QDateTime>
 #include <QCursor>
+#include <QPainterPath>
 
 CompactMailDelegate::CompactMailDelegate(QObject *parent)
     : QStyledItemDelegate(parent)
@@ -220,6 +221,21 @@ void CompactMailDelegate::drawCard(QPainter *painter, const QStyleOptionViewItem
     painter->setPen(dateColor);
     painter->drawText(QRect(x + senderMaxWidth + 8, line1Y, dateWidth, dateFM.height()), Qt::AlignRight | Qt::AlignVCenter, dateStr);
 
+    // Pinned indicator (top-right, next to unread dot)
+    bool isPinned = index.data(EmailListModel::IsPinnedRole).toBool();
+    if (isPinned) {
+        int pinSize = 10;
+        QRect pinRect(cardRect.right() - 12 - pinSize, cardRect.top() + 12, pinSize, pinSize);
+        painter->setBrush(QColor(0xff, 0x95, 0x00)); // orange
+        painter->setPen(Qt::NoPen);
+        // Draw pushpin shape
+        QPainterPath pinPath;
+        pinPath.addEllipse(pinRect.center().x() - 2, pinRect.top() + 2, 4, 4); // head
+        pinPath.moveTo(pinRect.center().x(), pinRect.top() + 6);
+        pinPath.lineTo(pinRect.center().x(), pinRect.bottom() - 2); // shaft
+        painter->drawPath(pinPath);
+    }
+
     // Line 2: Subject + Attachment icon
     int line2Y = line1Y + senderFM.height() + 2;
     QString subjectPrefix = "";

src/ui/maillistview.cpp

@@ -69,6 +69,10 @@ void MailListView::setupUI()
     m_hasAttachmentsCheck->setStyleSheet("QCheckBox { font-size: 12px; color: #333; }");
     filterLayout->addWidget(m_hasAttachmentsCheck);
 
+    m_pinnedOnlyCheck = new QCheckBox("Solo fijados");
+    m_pinnedOnlyCheck->setStyleSheet("QCheckBox { font-size: 12px; color: #333; }");
+    filterLayout->addWidget(m_pinnedOnlyCheck);
+
     filterLayout->addStretch();
 
     // Display mode combo (Compact/Medium/Spacious)
@@ -209,6 +213,7 @@ void MailListView::setupUI()
     connect(m_unreadOnlyCheck, &QCheckBox::toggled, this, &MailListView::onFilterChanged);
     connect(m_flaggedOnlyCheck, &QCheckBox::toggled, this, &MailListView::onFilterChanged);
     connect(m_hasAttachmentsCheck, &QCheckBox::toggled, this, &MailListView::onFilterChanged);
+    connect(m_pinnedOnlyCheck, &QCheckBox::toggled, this, &MailListView::onFilterChanged);
 }
 
 void MailListView::setModel(EmailListModel *model)
@@ -287,6 +292,7 @@ void MailListView::onFilterChanged()
     m_sourceModel->setShowUnreadOnly(m_unreadOnlyCheck->isChecked());
     m_sourceModel->setShowFlaggedOnly(m_flaggedOnlyCheck->isChecked());
     m_sourceModel->setShowHasAttachments(m_hasAttachmentsCheck->isChecked());
+    m_sourceModel->setShowPinnedOnly(m_pinnedOnlyCheck->isChecked());
 }
 
 void MailListView::onGroupByChanged(int index)

src/ui/maillistview.h

@@ -80,6 +80,7 @@ private:
     QCheckBox *m_unreadOnlyCheck;
     QCheckBox *m_flaggedOnlyCheck;
     QCheckBox *m_hasAttachmentsCheck;
+    QCheckBox *m_pinnedOnlyCheck;
     QComboBox *m_groupByCombo;
     QComboBox *m_displayModeCombo;
     CompactMailDelegate *m_compactDelegate = nullptr;

src/ui/models/EmailListModel.cpp

@@ -109,9 +109,9 @@ void EmailListModel::fetchMore(const QModelIndex &parent)
 
     QVector<MailItem> newEmails;
     if (m_folderId == -1) {
-        newEmails = MailItemDao::findAllPaginated(offset, fetchCount, m_searchFilter, m_unreadOnly, m_flaggedOnly, m_hasAttachments);
+        newEmails = MailItemDao::findAllPaginated(offset, fetchCount, m_searchFilter, m_unreadOnly, m_flaggedOnly, m_hasAttachments, m_pinnedOnly);
     } else {
-        newEmails = MailItemDao::findByFolderIdPaginated(m_folderId, offset, fetchCount, m_searchFilter, m_unreadOnly, m_flaggedOnly, m_hasAttachments);
+        newEmails = MailItemDao::findByFolderIdPaginated(m_folderId, offset, fetchCount, m_searchFilter, m_unreadOnly, m_flaggedOnly, m_hasAttachments, m_pinnedOnly);
     }
 
     if (newEmails.isEmpty())
@@ -139,9 +139,9 @@ void EmailListModel::refresh()
 
     // Get total count
     if (m_folderId == -1) {
-        m_totalCount = MailItemDao::countAll(m_searchFilter, m_unreadOnly, m_flaggedOnly, m_hasAttachments);
+        m_totalCount = MailItemDao::countAll(m_searchFilter, m_unreadOnly, m_flaggedOnly, m_hasAttachments, m_pinnedOnly);
     } else {
-        m_totalCount = MailItemDao::countByFolderId(m_folderId, m_searchFilter, m_unreadOnly, m_flaggedOnly, m_hasAttachments);
+        m_totalCount = MailItemDao::countByFolderId(m_folderId, m_searchFilter, m_unreadOnly, m_flaggedOnly, m_hasAttachments, m_pinnedOnly);
     }
 
     emit totalCountChanged(m_totalCount);
@@ -150,9 +150,9 @@ void EmailListModel::refresh()
     int fetchCount = qMin(m_batchSize, m_totalCount);
     QVector<MailItem> firstBatch;
     if (m_folderId == -1) {
-        firstBatch = MailItemDao::findAllPaginated(0, fetchCount, m_searchFilter, m_unreadOnly, m_flaggedOnly, m_hasAttachments);
+        firstBatch = MailItemDao::findAllPaginated(0, fetchCount, m_searchFilter, m_unreadOnly, m_flaggedOnly, m_hasAttachments, m_pinnedOnly);
     } else {
-        firstBatch = MailItemDao::findByFolderIdPaginated(m_folderId, 0, fetchCount, m_searchFilter, m_unreadOnly, m_flaggedOnly, m_hasAttachments);
+        firstBatch = MailItemDao::findByFolderIdPaginated(m_folderId, 0, fetchCount, m_searchFilter, m_unreadOnly, m_flaggedOnly, m_hasAttachments, m_pinnedOnly);
     }
     m_emails = firstBatch;
     m_loadedCount = firstBatch.size();
@@ -192,3 +192,11 @@ void EmailListModel::setShowHasAttachments(bool show)
     m_hasAttachments = show;
     refresh();
 }
+
+void EmailListModel::setShowPinnedOnly(bool show)
+{
+    if (m_pinnedOnly == show)
+        return;
+    m_pinnedOnly = show;
+    refresh();
+}

src/ui/models/EmailListModel.h

@@ -49,8 +49,8 @@ public:
     void setShowUnreadOnly(bool show);
     void setShowFlaggedOnly(bool show);
     void setShowHasAttachments(bool show);
-    // Set batch size for pagination
-    void setBatchSize(int size) { m_batchSize = size; }
+    // Set filter for pinned emails
+    void setShowPinnedOnly(bool show);
 
     // Get all emails currently in the model (after filtering)
     const QVector<MailItem>& emails() const { return m_emails; }
@@ -68,6 +68,7 @@ private:
     bool m_unreadOnly{false};
     bool m_flaggedOnly{false};
     bool m_hasAttachments{false};
+    bool m_pinnedOnly{false};
     int m_batchSize{50}; // emails per fetch
     int m_loadedCount{0}; // how many emails currently loaded
     int m_totalCount{0}; // total matching emails in DB