Remove manual date entry and automate timestamp for new sales records

Removes dateVente field from NewSaleForm, sale types, and shared schema.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: dec54137-d5a2-4406-8ad4-5f2f9fb110bf
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/0715008c-7244-40f4-befc-26c014852236/fa7f08e0-2cf1-49d3-8250-af23db9cc3bd.jpg

replit.md

@@ -238,6 +238,8 @@ Preferred communication style: Simple, everyday language.
 - ✅ Removed section borders for cleaner design with color-coded backgrounds
 - ✅ Added border to reset button for better visibility
 - ✅ Optimized border thickness for better balance between visibility and aesthetics
+- ✅ Removed manual date field from new sale form - timestamp now automatically recorded
+- ✅ Automatic date/time creation ensures accuracy and prevents manual entry errors
 
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