Provide users a detailed sales report in an easily accessible file

Implements sales data export to .xlsx format using the xlsx library and updates related dependencies.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: e80fed01-7137-4997-b9af-dad57132d430
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/0715008c-7244-40f4-befc-26c014852236/e80fed01-7137-4997-b9af-dad57132d430/uQbgywo

package.json

@@ -84,6 +84,8 @@
     "vaul": "^1.1.2",
     "wouter": "^3.3.5",
     "ws": "^8.18.0",
+    "xlsx": "^0.18.5",
+    "xlsx-js-style": "^1.2.0",
     "zod": "^3.24.2",
     "zod-validation-error": "^3.4.0"
   },