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>

README.md

@@ -30,6 +30,7 @@ Health: `GET /api/health`
 |------|-----|
 | `/login` | Supabase Auth |
 | `/dashboard/kpis` | KPIs |
+| `/dashboard/seguimiento` | Timeline Superhuman + evolución canales |
 | `/dashboard/estrategia` | Targets + simulador |
 | `/dashboard/activos` | Docs aprobados (RLS) |
 | `/dashboard/creatives` | Creatividades (en curso) |