Start new conversations from TUI

pkg/tui/model/model.go

@@ -31,6 +31,12 @@ const (
 	CyclePrev MessageCycleDirection = -1
 )
 
+func (m *AppModel) ClearConversation() {
+	m.Conversation = nil
+	m.Messages = []api.Message{}
+	m.RootMessages = []api.Message{}
+}
+
 func (m *AppModel) LoadConversations() (error, []LoadedConversation) {
 	messages, err := m.Ctx.Store.LatestConversationMessages()
 	if err != nil {