Add TUI hardware banner and polish SAT summaries

audit/internal/tui/update.go

@@ -84,6 +84,9 @@ func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		m.screen = screenExportTargets
 		m.cursor = 0
 		return m, nil
+	case bannerMsg:
+		m.banner = strings.TrimSpace(msg.text)
+		return m, nil
 	}
 
 	return m, nil