feat: interactive seguimiento timeline and channel evolution

Sync Superhuman Docs seguimiento/KPI pages into the portal (never passwords)
and show clients a dynamic timeline plus per-channel kpi_weekly charts.

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

src/app/api/seguimiento/route.ts

@@ -0,0 +1,107 @@
+import { NextResponse } from 'next/server';
+import { createClient } from '@/lib/supabase/server';
+import { resolveActiveTenant, restGet } from '@/lib/tenant-context';
+import { isAgencyRole, userRole } from '@/lib/agency';
+import {
+  AdDailyRow,
+  KpiWeeklyRow,
+  buildChannelSeries,
+} from '@/lib/metrics';
+
+export const dynamic = 'force-dynamic';
+
+export type SeguimientoEntry = {
+  id: string;
+  tenant_id: string;
+  entry_type: string;
+  title: string;
+  summary?: string | null;
+  body_md?: string | null;
+  browser_link?: string | null;
+  metrics?: Record<string, unknown>;
+  occurred_at?: string | null;
+  synced_at?: string;
+};
+
+/** GET seguimiento timeline + channel evolution for active tenant. */
+export async function GET() {
+  const supabase = await createClient();
+  const {
+    data: { user },
+  } = await supabase.auth.getUser();
+  if (!user) {
+    return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
+  }
+
+  const ctx = await resolveActiveTenant(user);
+  const agency = isAgencyRole(userRole(user));
+
+  if (agency && ctx.portfolioWide) {
+    return NextResponse.json({
+      label: ctx.label,
+      portfolioWide: true,
+      entries: [],
+      channelSeries: { weeks: [], channels: [], points: [] },
+      hint: 'Elige un cliente en el selector para ver su seguimiento y evolución de canales.',
+    });
+  }
+
+  const tenantId = ctx.tenantId;
+  if (!tenantId) {
+    return NextResponse.json({ error: 'Sin tenant' }, { status: 400 });
+  }
+
+  let entries: SeguimientoEntry[] = [];
+  let weekly: KpiWeeklyRow[] = [];
+  let daily: AdDailyRow[] = [];
+
+  if (agency && ctx.viaView) {
+    const tid = encodeURIComponent(tenantId);
+    const [e, w, d] = await Promise.all([
+      restGet<SeguimientoEntry[]>(
+        `/rest/v1/seguimiento_entries?tenant_id=eq.${tid}&select=*&order=occurred_at.desc.nullslast&limit=80`
+      ),
+      restGet<KpiWeeklyRow[]>(
+        `/rest/v1/kpi_weekly?tenant_id=eq.${tid}&select=*&order=week.asc`
+      ),
+      restGet<AdDailyRow[]>(
+        `/rest/v1/ad_daily?tenant_id=eq.${tid}&select=*&order=date.asc&limit=400`
+      ),
+    ]);
+    entries = e.data || [];
+    weekly = w.data || [];
+    daily = d.data || [];
+  } else {
+    const [{ data: e }, { data: w }, { data: d }] = await Promise.all([
+      supabase
+        .from('seguimiento_entries')
+        .select('*')
+        .order('occurred_at', { ascending: false, nullsFirst: false })
+        .limit(80),
+      supabase.from('kpi_weekly').select('*').order('week', { ascending: true }),
+      supabase
+        .from('ad_daily')
+        .select('*')
+        .order('date', { ascending: true })
+        .limit(400),
+    ]);
+    entries = (e as SeguimientoEntry[]) || [];
+    weekly = (w as KpiWeeklyRow[]) || [];
+    daily = (d as AdDailyRow[]) || [];
+  }
+
+  const channelSeries = buildChannelSeries(weekly);
+
+  return NextResponse.json({
+    label: ctx.label,
+    portfolioWide: false,
+    tenantId,
+    entries,
+    channelSeries,
+    dailySummary: {
+      days: daily.length,
+      spend: daily.reduce((a, r) => a + Number(r.spend || 0), 0),
+      leads: daily.reduce((a, r) => a + Number(r.platform_leads || 0), 0),
+    },
+  });
+}