feat : ajout d'un champ commentaire sur les contrats + correction de plusieurs bugs

frontend/components/employees/ContractTab.vue

@@ -86,6 +86,19 @@
           <p v-if="showContractEndDateError" class="mt-1 text-sm text-red-600">La date de fin est obligatoire.</p>
         </div>
 
+        <div>
+          <label class="text-md font-semibold text-neutral-700" for="contract-comment">
+            Commentaire
+          </label>
+          <textarea
+            id="contract-comment"
+            v-model="contractForm.comment"
+            rows="3"
+            class="mt-2 w-full rounded-md border border-neutral-300 px-3 py-2 text-base text-neutral-900 focus:border-primary-500 focus:outline-none focus:ring-2 focus:ring-secondary-500/20"
+            placeholder="Motif de la clôture..."
+          />
+        </div>
+
         <div class="rounded-md border border-neutral-200 bg-neutral-50 p-3">
           <label class="inline-flex items-center gap-2 text-md font-semibold text-neutral-700" for="contract-paid-leave-settled">
             <input
@@ -191,6 +204,7 @@ type ContractForm = {
   startDate: string
   endDate: string
   paidLeaveSettled: boolean
+  comment: string
 }
 
 type CreateContractForm = {