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/lib/types.ts

@@ -24,6 +24,21 @@ export interface Repo {
   release: Release | null
 }
 
+/** An operator-defined button, as listed by the server. An empty `kinds` matches every alert kind. */
+export interface ActionDef {
+  id: string
+  label: string
+  confirm?: string
+  kinds: string[]
+}
+
+/** Status of an action for one alert; `link` is an http(s) address when present. */
+export interface ActionStatus {
+  state: string
+  label?: string
+  link?: string
+}
+
 export interface Alert {
   repo: string
   kind: string
@@ -32,6 +47,7 @@ export interface Alert {
   detail: string
   url: string
   since: string
+  actionStatus?: Record<string, ActionStatus>
 }
 
 export interface Thresholds {
@@ -54,6 +70,8 @@ export interface TrackerState {
   thresholds: Thresholds
   repos: Repo[]
   alerts: Alert[]
+  actions?: ActionDef[]
+  actionsError?: string
 }
 
 /** Answer to a single-repository refresh: the state after it, plus the repo name. */
@@ -61,12 +79,15 @@ export type RepoRefreshResult = TrackerState & { repo: string }
 
 /** One line in a repo block: every alert that targets the same URL, merged. */
 export interface Row {
+  repo: string
   kind: string
   subject: string
   detail: string
   url: string
   since: string
   severity: Exclude<Severity, 'ok'>
+  actions?: ActionDef[]
+  actionStatus?: Record<string, ActionStatus>
 }
 
 export interface Block {