Improve sales data export to correctly include images in spreadsheet

Refactors the exportToExcel function to use exceljs, adding image support and fixing data formatting for spreadsheet generation.

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/CurNnXi

package.json

@@ -55,6 +55,7 @@
     "drizzle-orm": "^0.39.1",
     "drizzle-zod": "^0.7.0",
     "embla-carousel-react": "^8.6.0",
+    "exceljs": "^4.4.0",
     "express": "^4.21.2",
     "express-session": "^1.18.1",
     "framer-motion": "^11.13.1",