Fix Streamlit server deployment: headless mode, default 7-day range, error handling

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.streamlit/config.toml

@@ -1,2 +1,5 @@
 [server]
 port = 15001
+headless = true
+enableCORS = false
+enableXsrfProtection = false

dashboard.py

@@ -87,10 +87,11 @@ def _load_detail(campaign_id: str, date_from: str, date_to: str):
 st.sidebar.title("Filtros")
 today          = date.today()
 yesterday      = today - timedelta(days=1)
+default_from   = yesterday - timedelta(days=6)  # últimos 7 días por defecto
 first_of_month = today.replace(day=1)
 
 c1, c2 = st.sidebar.columns(2)
-date_from = c1.date_input("Desde", value=first_of_month, max_value=yesterday)
+date_from = c1.date_input("Desde", value=default_from, max_value=yesterday)
 date_to   = c2.date_input("Hasta", value=yesterday, min_value=date_from, max_value=yesterday)
 
 if st.sidebar.button("🔄 Actualizar", use_container_width=True):
@@ -105,7 +106,11 @@ if date_from > date_to:
 
 # ── Data ──────────────────────────────────────────────────────────────────────
 
-daily_rows, campaign_metrics, vertical_cpls = _load_data(date_from_str, date_to_str)
+try:
+    daily_rows, campaign_metrics, vertical_cpls = _load_data(date_from_str, date_to_str)
+except Exception as _e:
+    st.error(f"Error cargando datos de Meta API: {_e}")
+    st.stop()
 
 # Aggregate daily totals with per-vertical margins
 _daily: dict = {}