fix tokens

packages/tui/internal/tui/components/core/status.go

@@ -151,7 +151,7 @@ func (m statusCmp) View() string {
 			if message.Metadata.Assistant != nil {
 				cost += message.Metadata.Assistant.Cost
 				usage := message.Metadata.Assistant.Tokens
-				tokens += (usage.Input + usage.Output + usage.Reasoning)
+				tokens = (usage.Input + usage.Output + usage.Reasoning)
 			}
 		}