feat(ui): show alert action buttons and status chips

Alerts that match a configured action get a button labelled from the
config. A confirm dialog opens first when the action defines confirm text.
After a press the UI posts the alert, reloads the state through the
existing poll path and shows the reported status as a chip, with an anchor
when the status carries a link.

The alert dialog comes from reka-ui through the usual shadcn-vue wrappers.

src/components/ui/alert-dialog/AlertDialog.vue

@@ -0,0 +1,15 @@
+<script setup lang="ts">
+import type { AlertDialogEmits, AlertDialogProps } from 'reka-ui'
+import { AlertDialogRoot, useForwardPropsEmits } from 'reka-ui'
+
+const props = defineProps<AlertDialogProps>()
+const emits = defineEmits<AlertDialogEmits>()
+
+const forwarded = useForwardPropsEmits(props, emits)
+</script>
+
+<template>
+  <AlertDialogRoot data-slot="alert-dialog" v-bind="forwarded">
+    <slot />
+  </AlertDialogRoot>
+</template>