Restrict employees from creating tasks and adjust other permissions

Update role permissions to prevent employees from creating tasks, while ensuring they can view tasks and suppliers. Adjustments also made to director and manager permissions for product validation.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: b163d4c0-de5e-4f4e-a9c0-aed4c7049718
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/1957c339-2757-4d1f-8e92-e9f71a1ce58e/b163d4c0-de5e-4f4e-a9c0-aed4c7049718/69xEJ3P

shared/permissions.ts

@@ -80,12 +80,12 @@ const PERMISSIONS: Record<Module, Record<Role, Permission[]>> = {
     employee: ['view', 'create']
   },
 
-  // Tâches - Admin/Directeur tout, Manager view + validate, Employé view + create
+  // Tâches - Admin/Directeur tout, Manager view + validate, Employé view seulement
   tasks: {
     admin: ['view', 'create', 'edit', 'delete', 'validate'],
     directeur: ['view', 'create', 'edit', 'delete', 'validate'],
     manager: ['view', 'validate'],
-    employee: ['view', 'create']
+    employee: ['view']
   }
 };