Cleaned up assistant cursor handling

pkg/tui/views/chat/update.go

@@ -93,7 +93,7 @@ func (m Model) Update(msg tea.Msg) (Model, tea.Cmd) {
 			// append chunk to existing message
 			m.setMessageContents(last, m.messages[last].Content+msg.Content)
 		} else {
-			// use chunk in new message
+			// use chunk in a new message
 			m.addMessage(api.Message{
 				Role:    api.MessageRoleAssistant,
 				Content: msg.Content,
@@ -177,6 +177,8 @@ func (m Model) Update(msg tea.Msg) (Model, tea.Cmd) {
 	case cursor.BlinkMsg:
 		if m.state == pendingResponse {
 			// ensure we show the updated "wait for response" cursor blink state
+			last := len(m.messages)-1
+			m.messageCache[last] = m.renderMessage(last)
 			m.updateContent()
 		}
 	case msgConversationPersisted: