/**
 * [WHO]: generateHtmlReport
 * [FROM]: Depends on ./types
 * [TO]: Consumed by ./index
 * [HERE]: extensions/builtin/insights/html-report.ts - HTML usage-report renderer
 *
 * HTML report generation for the /insights command.
 *
 * 1:1 port of Claude Code src/commands/insights.ts generateHtmlReport()
 * with helpers: escapeHtml, escapeHtmlWithBold, generateBarChart,
 * generateResponseTimeHistogram, generateTimeOfDayChart, getHourCountsJson.
 *
 * Changes from CC:
 * - "Claude Code" → "Catui"
 * - Removed: Multi-Clauding section (CC-specific)
 * - Removed: Team Feedback section (ant-only)
 * - Removed: S3 upload logic
 * - Timezone defaults to local timezone instead of PT
 */
import type { AggregatedData, InsightResults } from "./types.js";
export declare function generateHtmlReport(data: AggregatedData, insights: InsightResults): string;