fix(request): reassign sequential orders when all signers share same signingOrder

The API returns signingOrder: 1 as the default for every signer.
When the user enables "Sign in order", onPreserveOrderChange() checked
Because git log -p === false, every signer was skipped and all remained at
order 1, causing the backend to notify all signers simultaneously
instead of sequentially.

Fix: detect duplicate orders with a Set comparison and force
re-assignment when duplicates are found.

Signed-off-by: Vitor Mattos <1079143+vitormattos@users.noreply.github.com>

Author: vitormattos

src/components/RightSidebar/RequestSignatureTab.vue

@@ -744,8 +744,10 @@ export default {
 
 			if (value) {
 				if (file?.signers) {
+					const orders = file.signers.map(s => s.signingOrder || 0)
+					const hasDuplicateOrders = orders.length !== new Set(orders).size
 					file.signers.forEach((signer, index) => {
-						if (!signer.signingOrder) {
+						if (!signer.signingOrder || hasDuplicateOrders) {
 							signer.signingOrder = index + 1
 						}
 					})