chore: add E2E demo showcase excel spreadsheet, generator script, and updated screenshots

scripts/generate-showcase-excel.js

@@ -0,0 +1,36 @@
+const XLSX = require('xlsx');
+const fs = require('fs');
+const path = require('path');
+
+const data = [
+  {
+    'Colaborador': 'colaborador_mde',
+    'Periodo': '2026-06',
+    'Hotel': 'EST-MDE',
+    'Monto': 120000,
+    'Cantidad': 10,
+    'Id_Transaccion': 'TX-MDE-001'
+  },
+  {
+    'Colaborador': 'lider_ctg',
+    'Periodo': '2026-06',
+    'Hotel': 'EST-CTG',
+    'Monto': 2500000, // Anomaly trigger (value > 1,000,000)
+    'Cantidad': 15,
+    'Id_Transaccion': 'TX-CTG-002'
+  }
+];
+
+const wb = XLSX.utils.book_new();
+const ws = XLSX.utils.json_to_sheet(data);
+XLSX.utils.book_append_sheet(wb, ws, 'Sales Import');
+
+// Ensure target directories exist
+const dir = path.join(__dirname, '../public/templates');
+if (!fs.existsSync(dir)) {
+  fs.mkdirSync(dir, { recursive: true });
+}
+
+const outputPath = path.join(dir, 'demo_sales_data.xlsx');
+XLSX.writeFile(wb, outputPath);
+console.log(`Successfully generated demo spreadsheet at: ${outputPath}`);