feat: integrate ExcelJS for enhanced report generation, replacing XLSX in the employee leave report functionality, and update styling for improved user experience

apps/web/package.json

@@ -49,6 +49,7 @@
     "date-fns": "^4.1.0",
     "emoji-picker-element": "^1.27.0",
     "eslint": "catalog:",
+    "exceljs": "^4.4.0",
     "is-network-error": "^1.3.0",
     "jspdf": "^3.0.3",
     "jspdf-autotable": "^5.0.2",
@@ -57,6 +58,7 @@
     "papaparse": "^5.4.1",
     "svelte-sonner": "^1.0.5",
     "xlsx": "^0.18.5",
+    "xlsx-js-style": "^1.2.0",
     "zod": "^4.1.12"
   }
 }