chatgui: выпилить все записи в БД из GUI потока (DbManager)

- DbManager теперь read-only, получает sqlite3* handle через setDb()
- chat_core — единственный владелец БД (SQLITE_OPEN_FULLMUTEX + WAL)
- initTables/seedStubData/createChannel/insertMessage/setUiState удалены из DbManager
- seed 5 stub-аккаунтов перенесён в chat_core_init()
- GUI_EVT_DB_READY — уведомление о готовности БД
- setUiState заменён на QSettings
- каналы загружаются по DB_READY коллбэку
- убран двойной sqlite3_open (один файл, один хендл)

tools/chatgui/src/mainwindow.cpp

@@ -16,6 +16,7 @@
 #include <QStyle>
 #include <QMessageBox>
 #include <QDebug>
+#include <QSettings>
 
 extern "C" {
 #include "../transport/chat_core.h"
@@ -78,7 +79,7 @@ MainWindow::MainWindow(QWidget *parent, DbManager* db, const QString& cfgPath,
     setupUi();
     setupTray();
 
-    if (m_db && m_db->isOpen()) {
+    if (m_db) {
         s_mainWindow = this;
         gui_bridge_set_msg_received_cb(onMsgReceivedCallback);
         gui_bridge_set_channel_updated_cb(onChannelUpdatedCallback);
@@ -89,13 +90,25 @@ MainWindow::MainWindow(QWidget *parent, DbManager* db, const QString& cfgPath,
         });
         gui_bridge_set_auto_connect_status_cb(onAutoConnectStatusCallback);
         gui_bridge_set_channel_peers_online_cb(onChannelPeersOnlineCallback);
+        gui_bridge_set_db_ready_cb([]() {
+            if (!s_mainWindow || !s_mainWindow->m_db) return;
+            s_mainWindow->m_db->setDb(chat_core_get_db());
+            s_mainWindow->m_channelList->loadChannels();
+
+            QString lastCid = QSettings().value("last_channel_id").toString();
+            if (!lastCid.isEmpty()) {
+                s_mainWindow->m_channelList->selectChannel(lastCid);
+                s_mainWindow->m_accountList->setChannel(lastCid);
+            }
+        });
 
         setupNode();
         setupMessaging();
 
         connect(m_channelList, &ChannelList::channelSelected,
                 this, [this](const QString& channelId) {
-                    m_db->setUiState("last_channel_id", channelId);
+                    QSettings().setValue("last_channel_id", channelId);
+                    m_currentChannelId = channelId;
                     m_messageList->loadChannel(channelId);
                     m_accountList->setChannel(channelId);
                 });
@@ -108,14 +121,6 @@ MainWindow::MainWindow(QWidget *parent, DbManager* db, const QString& cfgPath,
                 this, &MainWindow::onCreateGroupRequested);
         connect(m_channelList, &ChannelList::settingsRequested,
                 this, &MainWindow::showSettings);
-
-        m_channelList->loadChannels();
-
-        QString lastCid = m_db->getUiState("last_channel_id");
-        if (!lastCid.isEmpty()) {
-            m_channelList->selectChannel(lastCid);
-            m_accountList->setChannel(lastCid);
-        }
     }
 }
 
@@ -266,7 +271,7 @@ void MainWindow::onMessageReceived(const char* ch_id) {
 }
 
 void MainWindow::onMembersChanged(const char* ch_id) {
-    QString cur = m_db->getUiState("last_channel_id");
+    QString cur = QSettings().value("last_channel_id").toString();
     if (cur == QString::fromUtf8(ch_id))
         m_accountList->refresh();
 }
@@ -292,7 +297,8 @@ void MainWindow::reloadChannels() {
             m_channelList->selectChannel(m_pendingChannelSelect);
             m_accountList->setChannel(m_pendingChannelSelect);
             m_messageList->loadChannel(m_pendingChannelSelect);
-            m_db->setUiState("last_channel_id", m_pendingChannelSelect);
+            QSettings().setValue("last_channel_id", m_pendingChannelSelect);
+            m_currentChannelId = m_pendingChannelSelect;
             m_pendingChannelSelect.clear();
         }
     }