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/AlertDialogFooter.vue

@@ -0,0 +1,15 @@
+<script setup lang="ts">
+import type { HTMLAttributes } from 'vue'
+import { cn } from '@/lib/utils'
+
+const props = defineProps<{ class?: HTMLAttributes['class'] }>()
+</script>
+
+<template>
+  <div
+    data-slot="alert-dialog-footer"
+    :class="cn('flex flex-col-reverse gap-2 sm:flex-row sm:justify-end', props.class)"
+  >
+    <slot />
+  </div>
+</template>