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/AlertDialogCancel.vue

@@ -0,0 +1,21 @@
+<script setup lang="ts">
+import type { AlertDialogCancelProps } from 'reka-ui'
+import type { HTMLAttributes } from 'vue'
+import { reactiveOmit } from '@vueuse/core'
+import { AlertDialogCancel } from 'reka-ui'
+import { cn } from '@/lib/utils'
+import { buttonVariants } from '@/components/ui/button'
+
+const props = defineProps<AlertDialogCancelProps & { class?: HTMLAttributes['class'] }>()
+
+const delegatedProps = reactiveOmit(props, 'class')
+</script>
+
+<template>
+  <AlertDialogCancel
+    v-bind="delegatedProps"
+    :class="cn(buttonVariants({ variant: 'outline' }), props.class)"
+  >
+    <slot />
+  </AlertDialogCancel>
+</template>