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>

src/pages/consumption/ConsumptionPage.tsx

@@ -130,7 +130,7 @@ export default function ConsumptionPage() {
       r.meterName || "—",
       r.meterSerialNumber || "—",
       r.meterLocation || "—",
-      r.readingValue.toFixed(2),
+      Number(r.readingValue).toFixed(2),
       r.readingType || "—",
       r.batteryLevel !== null ? `${r.batteryLevel}%` : "—",
       r.signalStrength !== null ? `${r.signalStrength} dBm` : "—",
@@ -210,7 +210,7 @@ export default function ConsumptionPage() {
           <StatCard
             icon={<Droplets />}
             label="Consumo Promedio"
-            value={`${summary?.avgReading.toFixed(1) ?? "0"} m³`}
+            value={`${summary?.avgReading != null ? Number(summary.avgReading).toFixed(1) : "0"} m³`}
             loading={loadingSummary}
             gradient="from-violet-500 to-purple-600"
           />
@@ -429,7 +429,7 @@ export default function ConsumptionPage() {
                       </td>
                       <td className="px-5 py-3.5 text-right">
                         <span className="text-sm font-semibold text-slate-800 tabular-nums">
-                          {reading.readingValue.toFixed(2)}
+                          {Number(reading.readingValue).toFixed(2)}
                         </span>
                         <span className="text-xs text-slate-400 ml-1">m³</span>
                       </td>

src/pages/meters/MeterPage.tsx

@@ -331,11 +331,13 @@ export default function MetersPage({
 
       {showBulkUpload && (
         <MetersBulkUploadModal
-          onClose={() => setShowBulkUpload(false)}
-          onSuccess={() => {
+          onClose={() => {
             m.loadMeters();
             setShowBulkUpload(false);
           }}
+          onSuccess={() => {
+            m.loadMeters();
+          }}
         />
       )}
     </div>

src/pages/meters/MetersTable.tsx

@@ -72,7 +72,7 @@ export default function MetersTable({
             ),
           },
           { title: "Concentrador", field: "concentratorName", render: (r: Meter) => r.concentratorName || "-" },
-          { title: "Última Lectura", field: "lastReadingValue", render: (r: Meter) => r.lastReadingValue?.toFixed(2) ?? "-" },
+          { title: "Última Lectura", field: "lastReadingValue", render: (r: Meter) => r.lastReadingValue != null ? Number(r.lastReadingValue).toFixed(2) : "-" },
         ]}
         data={disabled ? [] : data}
         onRowClick={(_, rowData) => onRowClick(rowData as Meter)}