fix: alinear KPIs con Ad Tracker por días calendario

KPIs filtraba por inicio de semana (omitía días de Sep en la semana
del 31-ago); ahora Mes/7d/30d suman ad_daily día a día como Ad Tracker.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/lib/metrics.ts

@@ -312,3 +312,84 @@ export function resolveWeeklyRows(
 }
 
 export { isoDate, weekStart };
+
+/** Same calendar windows as Ad Tracker (inclusive day bounds, UTC). */
+export type KpiRangeKey = '7d' | '30d' | 'month' | 'all';
+
+export function resolveKpiDayRange(
+  range: KpiRangeKey,
+  now = new Date()
+): { since: string; until: string } | null {
+  const today = new Date(
+    Date.UTC(now.getUTCFullYear(), now.getUTCMonth(), now.getUTCDate())
+  );
+  const until = isoDate(today);
+  if (range === 'all') return null;
+  if (range === 'month') {
+    const since = new Date(Date.UTC(today.getUTCFullYear(), today.getUTCMonth(), 1));
+    return { since: isoDate(since), until };
+  }
+  const since = new Date(today);
+  // Inclusive windows: 7d = today-6..today, 30d = today-29..today
+  since.setUTCDate(since.getUTCDate() - (range === '7d' ? 6 : 29));
+  return { since: isoDate(since), until };
+}
+
+export function filterDailyByDayRange(
+  rows: AdDailyRow[],
+  since: string,
+  until: string
+): AdDailyRow[] {
+  return rows.filter((r) => {
+    const d = (r.date || '').slice(0, 10);
+    return d >= since && d <= until;
+  });
+}
+
+/** Per-channel paid totals from ad_daily (calendar days). */
+export function channelTotalsFromDaily(rows: AdDailyRow[]): {
+  channel: string;
+  spend: number;
+  leads: number;
+  deals: number;
+  revenue: number;
+  cpl: number;
+  roas: number;
+}[] {
+  const map = new Map<string, { spend: number; leads: number }>();
+  for (const r of rows) {
+    const channel = (r.platform || 'otros').toLowerCase();
+    const cur = map.get(channel) || { spend: 0, leads: 0 };
+    cur.spend += n(r.spend);
+    cur.leads += n(r.platform_leads ?? r.conversions);
+    map.set(channel, cur);
+  }
+  return [...map.entries()]
+    .map(([channel, v]) => ({
+      channel,
+      spend: v.spend,
+      leads: v.leads,
+      deals: 0,
+      revenue: 0,
+      cpl: v.leads > 0 ? v.spend / v.leads : 0,
+      roas: 0,
+    }))
+    .sort((a, b) => b.spend - a.spend);
+}
+
+export function metricTotalsFromDaily(rows: AdDailyRow[]): MetricTotals {
+  const spend = rows.reduce((a, r) => a + n(r.spend), 0);
+  const leads = rows.reduce(
+    (a, r) => a + n(r.platform_leads ?? r.conversions),
+    0
+  );
+  return {
+    spend,
+    leads,
+    deals: 0,
+    revenue: 0,
+    cac: 0,
+    roas: 0,
+    cpl: leads > 0 ? spend / leads : 0,
+  };
+}