fix: xlsx static import + type cast for TS build

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

package.json

@@ -10,13 +10,14 @@
     "lint": "eslint . --ext ts,tsx --report-unused-disable-directives --max-warnings 0"
   },
   "dependencies": {
+    "clsx": "^2.1.1",
+    "date-fns": "^3.6.0",
+    "lucide-react": "^0.446.0",
     "react": "^18.3.1",
     "react-dom": "^18.3.1",
     "react-router-dom": "^6.26.0",
-    "date-fns": "^3.6.0",
-    "lucide-react": "^0.446.0",
-    "clsx": "^2.1.1",
-    "tailwind-merge": "^2.5.2"
+    "tailwind-merge": "^2.5.2",
+    "xlsx": "^0.18.5"
   },
   "devDependencies": {
     "@types/react": "^18.3.5",