Fix: Corregir pantalla blanca y mejorar carga masiva

- Fix error .toFixed() con valores DECIMAL de PostgreSQL (string vs number)
- Fix modal de carga masiva que se cerraba sin mostrar resultados
- Validar fechas antes de insertar en BD (evita error con "Installed")
- Agregar mapeos de columnas comunes (device_status, device_name, etc.)
- Normalizar valores de status (Installed -> ACTIVE, New_LoRa -> ACTIVE)
- Actualizar documentación del proyecto

Archivos modificados:
- src/pages/meters/MetersTable.tsx
- src/pages/consumption/ConsumptionPage.tsx
- src/pages/meters/MeterPage.tsx
- water-api/src/services/bulk-upload.service.ts
- ESTADO_ACTUAL.md
- CAMBIOS_SESION.md

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

water-api/src/services/bulk-upload.service.ts

@@ -63,27 +63,54 @@ function normalizeColumnName(name: string): string {
 
   // Map common variations
   const mappings: Record<string, string> = {
+    // Serial number
     'serial': 'serial_number',
     'numero_de_serie': 'serial_number',
     'serial_number': 'serial_number',
+    'device_s/n': 'serial_number',
+    'device_sn': 'serial_number',
+    's/n': 'serial_number',
+    'sn': 'serial_number',
+    // Meter ID
     'meter_id': 'meter_id',
     'meterid': 'meter_id',
     'id_medidor': 'meter_id',
+    // Name
     'nombre': 'name',
     'name': 'name',
+    'device_name': 'name',
+    'meter_name': 'name',
+    'nombre_medidor': 'name',
+    // Concentrator
     'concentrador': 'concentrator_serial',
     'concentrator': 'concentrator_serial',
     'concentrator_serial': 'concentrator_serial',
     'serial_concentrador': 'concentrator_serial',
+    'gateway': 'concentrator_serial',
+    'gateway_serial': 'concentrator_serial',
+    // Location
     'ubicacion': 'location',
     'location': 'location',
+    'direccion': 'location',
+    'address': 'location',
+    // Type
     'tipo': 'type',
     'type': 'type',
+    'device_type': 'type',
+    'tipo_dispositivo': 'type',
+    'protocol': 'type',
+    'protocolo': 'type',
+    // Status
     'estado': 'status',
     'status': 'status',
+    'device_status': 'status',
+    'estado_dispositivo': 'status',
+    // Installation date
     'fecha_instalacion': 'installation_date',
     'installation_date': 'installation_date',
     'fecha_de_instalacion': 'installation_date',
+    'installed_time': 'installation_date',
+    'installed_date': 'installation_date',
   };
 
   return mappings[normalized] || normalized;
@@ -181,6 +208,19 @@ export async function bulkUploadMeters(buffer: Buffer): Promise<BulkUploadResult
       }
 
       // Prepare meter data
+      // Validate installation_date is actually a valid date
+      let installationDate: string | undefined = undefined;
+      if (row.installation_date) {
+        const dateStr = String(row.installation_date).trim();
+        // Check if it looks like a date (contains numbers and possibly dashes/slashes)
+        if (/^\d{4}[-/]\d{1,2}[-/]\d{1,2}/.test(dateStr) || /^\d{1,2}[-/]\d{1,2}[-/]\d{2,4}/.test(dateStr)) {
+          const parsed = new Date(dateStr);
+          if (!isNaN(parsed.getTime())) {
+            installationDate = parsed.toISOString().split('T')[0];
+          }
+        }
+      }
+
       const meterData: MeterRow = {
         serial_number: String(row.serial_number).trim(),
         meter_id: row.meter_id ? String(row.meter_id).trim() : undefined,
@@ -189,7 +229,7 @@ export async function bulkUploadMeters(buffer: Buffer): Promise<BulkUploadResult
         location: row.location ? String(row.location).trim() : undefined,
         type: row.type ? String(row.type).trim().toUpperCase() : 'LORA',
         status: row.status ? String(row.status).trim().toUpperCase() : 'ACTIVE',
-        installation_date: row.installation_date ? String(row.installation_date).trim() : undefined,
+        installation_date: installationDate,
       };
 
       // Validate type
@@ -198,11 +238,23 @@ export async function bulkUploadMeters(buffer: Buffer): Promise<BulkUploadResult
         meterData.type = 'LORA';
       }
 
-      // Validate status
-      const validStatuses = ['ACTIVE', 'INACTIVE', 'MAINTENANCE', 'FAULTY', 'REPLACED'];
-      if (!validStatuses.includes(meterData.status!)) {
-        meterData.status = 'ACTIVE';
-      }
+      // Validate and normalize status
+      const statusMappings: Record<string, string> = {
+        'ACTIVE': 'ACTIVE',
+        'INACTIVE': 'INACTIVE',
+        'MAINTENANCE': 'MAINTENANCE',
+        'FAULTY': 'FAULTY',
+        'REPLACED': 'REPLACED',
+        'INSTALLED': 'ACTIVE',
+        'NEW_LORA': 'ACTIVE',
+        'NEW': 'ACTIVE',
+        'ENABLED': 'ACTIVE',
+        'DISABLED': 'INACTIVE',
+        'OFFLINE': 'INACTIVE',
+        'ONLINE': 'ACTIVE',
+      };
+      const normalizedStatus = meterData.status?.toUpperCase().replace(/\s+/g, '_') || 'ACTIVE';
+      meterData.status = statusMappings[normalizedStatus] || 'ACTIVE';
 
       // Insert meter
       try {