/**
 * View 4 — "Package coupling heat map".
 *
 * Reads the engine-emitted `catalog.features.edge` rows (Plan C — the
 * dashboard no longer re-aggregates call edges client-side); each row is a
 * { callerPackage, calleePackage, count } directed coupling edge. Renders a
 * per-package N×N table with text-shaded density (CSS custom property
 * --coupling-density).
 *
 * The matrix is the WHOLE-GRAPH (unfiltered) coupling matrix — the filter
 * chips no longer narrow it (it is a whole-graph insight). When the catalog
 * carries no `edge` feature (a non-dashboard run) the view shows a no-data
 * empty state.
 *
 * Empty cells (no calls in this direction) show '·' and are not
 * clickable. Non-empty cells render the count; click → opens a
 * Function Card list of the actual call sites for that pair (the drilldown
 * keeps its own per-call-site walk, which the aggregate edge feature can't
 * provide).
 */
export declare function dashboardViewCouplingJs(): string;
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