Add ability to manually set due dates for tasks within the platform

Update ReconciliationModal to include a date input for due dates, allowing manual entry and proper formatting.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 1e4433b5-47ab-464c-b663-fea2e53367dd
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Event-Id: baf07a83-19d3-42bf-89b1-71e1469a5b03
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/1957c339-2757-4d1f-8e92-e9f71a1ce58e/1e4433b5-47ab-464c-b663-fea2e53367dd/y5yWvCQ

client/src/components/modals/ReconciliationModal.tsx

@@ -34,6 +34,7 @@ export default function ReconciliationModal({
     blAmount: "",
     invoiceReference: "",
     invoiceAmount: "",
+    dueDate: "",
     reconciled: false,
   });
 
@@ -45,6 +46,7 @@ export default function ReconciliationModal({
         blAmount: delivery.blAmount || "",
         invoiceReference: delivery.invoiceReference || "",
         invoiceAmount: delivery.invoiceAmount || "",
+        dueDate: delivery.dueDate ? safeFormat(delivery.dueDate, 'yyyy-MM-dd') : "",
         reconciled: delivery.reconciled || false,
       });
     }
@@ -85,6 +87,7 @@ export default function ReconciliationModal({
       blAmount: formData.blAmount ? formData.blAmount.toString() : null,
       invoiceReference: formData.invoiceReference.trim() || null,
       invoiceAmount: formData.invoiceAmount ? formData.invoiceAmount.toString() : null,
+      dueDate: formData.dueDate || null,
     });
   };
 
@@ -209,6 +212,17 @@ export default function ReconciliationModal({
                         placeholder="0.00"
                       />
                     </div>
+
+                    <div>
+                      <Label htmlFor="dueDate">Date d'Échéance</Label>
+                      <Input
+                        id="dueDate"
+                        type="date"
+                        value={formData.dueDate}
+                        onChange={(e) => setFormData(prev => ({ ...prev, dueDate: e.target.value }))}
+                        placeholder="jj/mm/aaaa"
+                      />
+                    </div>
                   </div>
                 </div>