feat: KPIs con totales absolutos, backfill ads y ventas en cruce canal

Comparativas WoW/MoM/YoY muestran prev/Δ además del %; sync ads admite
histórico desde 2025; tabla ads↔CRM añade cierres, ventas y ROAS.

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

src/lib/google-organic.ts

@@ -215,8 +215,9 @@ export async function applyOrganicMatches(
         meta: {
           property_id: m.ga4.propertyId,
           measurement_id: m.ga4.measurementId,
+          matched_at: new Date().toISOString(),
         },
-        last_sync_at: new Date().toISOString(),
+        // last_sync_at solo tras volcar organic_daily (no al emparejar)
         error_message: null,
       });
       if (ok) ga4 += 1;
@@ -231,8 +232,10 @@ export async function applyOrganicMatches(
           status: 'connected',
           external_account_id: m.gsc.siteUrl,
           label: m.gsc.siteUrl,
-          meta: { site_url: m.gsc.siteUrl },
-          last_sync_at: new Date().toISOString(),
+          meta: {
+            site_url: m.gsc.siteUrl,
+            matched_at: new Date().toISOString(),
+          },
           error_message: null,
         }
       );
@@ -686,19 +689,21 @@ export async function syncAllConnectedOrganic(opts?: {
         gscSiteUrl: cfg.gscSiteUrl,
         days,
       });
-      // bump last_sync on integrations
-      await fetch(
-        `${supabaseUrl()}/rest/v1/integrations?tenant_id=eq.${encodeURIComponent(tenantId)}&provider=in.(ga4,search_console)`,
-        {
-          method: 'PATCH',
-          headers: {
-            ...headers,
-            'Content-Type': 'application/json',
-            Prefer: 'return=minimal',
-          },
-          body: JSON.stringify({ last_sync_at: new Date().toISOString() }),
-        }
-      );
+      // Solo marcar last_sync_at si hubo filas (no mentir tras match vacío)
+      if (r.daysWritten > 0) {
+        await fetch(
+          `${supabaseUrl()}/rest/v1/integrations?tenant_id=eq.${encodeURIComponent(tenantId)}&provider=in.(ga4,search_console)`,
+          {
+            method: 'PATCH',
+            headers: {
+              ...headers,
+              'Content-Type': 'application/json',
+              Prefer: 'return=minimal',
+            },
+            body: JSON.stringify({ last_sync_at: new Date().toISOString() }),
+          }
+        );
+      }
       results.push({ tenantId, ...r });
     } catch (e) {
       results.push({