feat(19.7-01): admin SPA account contributions and prompted record actions

- AccountContributions.vue on My account: one card per contributed section
  with status and outline buttons; confirm or danger actions go through the
  shared ConfirmDialog; a returned URL opens in a new tab (noopener) and stays
  as a visible link; 409 reloads with the stale toast
- ConfirmRequest.prompt and useConfirm value; ConfirmDialog renders one
  labelled text input (maxlength, autocomplete off, aria-describedby comment,
  autofocus), confirm disabled until a value is typed, Enter confirms
- RecordActions posts {payload} for a prompted action and {} otherwise; a 422
  on payload shows the server's detail as a danger toast
- types.ts exports RecordActionPrompt, AccountContribution,
  AccountContributionAction, AccountActionResult
- vitest smokes AccountContributions.test.ts and RecordActionsPrompt.test.ts

admin/src/views/AccountView.vue

@@ -7,6 +7,7 @@ import { t } from '../app/i18n'
 import FormErrorBanner from '../components/form/FormErrorBanner.vue'
 import { controlClass } from '../components/form/control'
 import { fieldErrors, focusField } from '../components/form/formState'
+import AccountContributions from '../components/account/AccountContributions.vue'
 import ApiTokensPanel from '../components/account/ApiTokensPanel.vue'
 import Button from '../components/ui/Button.vue'
 import ConfirmDialog from '../components/ui/ConfirmDialog.vue'
@@ -411,6 +412,8 @@ async function onSave(): Promise<void> {
 
     <ApiTokensPanel :confirm="confirm" />
 
+    <AccountContributions :confirm="confirm" />
+
     <ConfirmDialog
       :open="confirm.request.value !== null"
       :message="confirm.request.value?.message ?? ''"