fix(api): normalize field briefing planned date

api-v3/src/act-administration/field-briefing.service.ts

@@ -36,6 +36,20 @@ export interface FieldBriefingAct {
   findings: FieldBriefingFinding[];
 }
 
+function toIsoDate(value: unknown): string {
+  const parsed = value instanceof Date
+    ? value
+    : value == null
+      ? new Date()
+      : new Date(String(value));
+
+  if (Number.isNaN(parsed.getTime())) {
+    throw new Error('La fecha planificada de la inspección no es válida');
+  }
+
+  return parsed.toISOString().slice(0, 10);
+}
+
 @Injectable()
 export class FieldBriefingService {
   constructor(private readonly dataSource: DataSource) {}
@@ -67,7 +81,9 @@ export class FieldBriefingService {
       });
     }
 
-    const plannedOn = String(visit.plannedStartAt ?? new Date().toISOString()).slice(0, 10);
+    // PostgreSQL/pg entrega los timestamptz como Date. String(date).slice(0, 10)
+    // produce textos como "Thu Sep 17", que PostgreSQL rechaza al castear a date.
+    const plannedOn = toIsoDate(visit.plannedStartAt);
 
     const rows = (await this.dataSource.query(`
       WITH prior_acts AS (