async parsing + tex caching

Plugins/ZShell/Llm/chatstore.hpp

@@ -3,6 +3,7 @@
 #include "session.hpp"
 
 #include <QObject>
+#include <QSet>
 #include <QSqlDatabase>
 #include <QString>
 #include <QVariantList>
@@ -38,6 +39,9 @@ class ChatStore : public QObject {
 
 	void persist(ChatSession* session);
 	void saveMeta(ChatSession* session);
+	// Loads the session's messages from the database. The SQL runs on a
+	// worker thread; the object tree is built and the model updated on
+	// the GUI thread when it arrives (ChatSession::loaded).
 	void loadMessagesInto(ChatSession* session);
 
 	Q_SIGNALS:
@@ -56,6 +60,10 @@ class ChatStore : public QObject {
 	QList<ChatSession*> m_sessions;
 	LlmClient* m_llmClient = nullptr;
 	QString m_connectionName;
+	QString m_dbPath;
+	// Sessions whose persist() ran before their messages finished
+	// loading; persisted once the load lands.
+	QSet<ChatSession*> m_pendingPersists;
 
 	[[nodiscard]] QSqlDatabase db() const;
 };