fix(qa): ISSUE-004 — show receipt ID in title immediately after save

Set receipt.value = savedReceipt before router.push() so modeTitle
computes 'Bon #123' even when Vue Router reuses the component instance
and onMounted does not re-run.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/modules/data-entry/views/receipts/ReceiptCreateUnifiedView.vue

@@ -936,6 +936,7 @@ const saveReceipt = async () => {
       life: 3000,
     })
 
+    receipt.value = savedReceipt
     router.push(`/data-entry/${savedReceipt.id}`)
   } catch (error) {
     toast.add({