fix: ensure unique component keys in Vue app

Improve key generation logic in swapComponent to ensure unique keys when navigating between pages.
This fixes the failing tests by:
- Using timestamp + random number for non-preserved state
- Maintaining explicit handling of KeepAliveId
- Ensuring consistent behavior with preserveState

packages/vue3/src/app.ts

@@ -88,9 +88,16 @@ const App: InertiaApp = defineComponent({
 
           const urlParams = new URLSearchParams(args.page.url.split('?')[1] || '')
           const id = urlParams.get('KeepAliveId')
-
           const componentName = (args.component as any)?.name || args.page.component
-          key.value = id ? `${componentName}-${id}` : (args.preserveState ? key.value : Date.now())
+
+          if (id) {
+            key.value = `${componentName}-${id}`
+          } else if (args.preserveState) {
+            key.value = key.value
+          } else {
+            // Use a combination of timestamp and random number to ensure uniqueness
+            key.value = `${Date.now()}-${Math.random()}`
+          }
         },
       })