VAlert closable prop and variant defaults change Vuetify 2 to Vuetify 3
A design goal is to use VAlert as the inline, persistent alert surface in a Vue 3 application with Vuetify 3 while keeping transient notification noise low. The intent is to reserve VSnackbar for transient notifications and keep VAlert for contextual, non-auto-dismissing feedback. The context involves a configuration transition from Vuetify 2 to Vuetify 3. T