Vendor Chatwoot Vue 3 frontend into frontend/

Copy the Chatwoot (v4.14.0) frontend runnable subset into frontend/ for
customization:
- app/javascript/ (Vue SPA: dashboard, widget, sdk, portal, superadmin)
- app/views/ (ERB templates for vite-plugin-ruby entrypoint resolution)
- app/helpers/, app/assets/ (Rails view helpers, static assets)
- enterprise/ (Enterprise edition frontend overlay)
- config/vite.json, vite.config.ts, bin/vite (Vite-Rails toolchain)
- package.json, pnpm-lock.yaml, tailwind/postcss/eslint configs
- Gemfile, Gemfile.lock (vite_rails gem for bin/vite binstub)

Excluded Rails backend: controllers, models, services, jobs, mailers,
policies, db, lib, spec, public, node_modules.

Update references to the new frontend location:
- .gitignore: exclude frontend build artifacts (node_modules, tmp, packs),
  keep frontend/bin/ and frontend/vendor/ via negation
- backend/scripts/parity_frontend_smoke.sh: CHATWOOT_DIR default
  reference/chatwoot -> ../frontend
- backend/scripts/parity_frontend_browser_smoke.mjs: same default update
- AGENTS.md: add frontend section with Rails/Vite coupling notes
- README: architecture tree includes frontend/

frontend/app/javascript/dashboard/components-next/Contacts/ContactsCard/ContactDeleteSection.vue

@@ -0,0 +1,68 @@
+<script setup>
+import { ref } from 'vue';
+import { useI18n } from 'vue-i18n';
+import { useToggle } from '@vueuse/core';
+
+import Button from 'dashboard/components-next/button/Button.vue';
+import ConfirmContactDeleteDialog from 'dashboard/components-next/Contacts/ContactsForm/ConfirmContactDeleteDialog.vue';
+import Policy from 'dashboard/components/policy.vue';
+
+defineProps({
+  selectedContact: {
+    type: Object,
+    required: true,
+  },
+});
+
+const { t } = useI18n();
+
+const [showDeleteSection, toggleDeleteSection] = useToggle();
+const confirmDeleteContactDialogRef = ref(null);
+
+const openConfirmDeleteContactDialog = () => {
+  confirmDeleteContactDialogRef.value?.dialogRef.open();
+};
+</script>
+
+<template>
+  <Policy :permissions="['administrator']">
+    <div class="flex flex-col items-start border-t border-n-strong px-6 py-5">
+      <Button
+        :label="t('CONTACTS_LAYOUT.DETAILS.DELETE_CONTACT')"
+        sm
+        link
+        slate
+        class="hover:!no-underline text-n-slate-12"
+        icon="i-lucide-chevron-down"
+        trailing-icon
+        @click="toggleDeleteSection()"
+      />
+
+      <div
+        class="transition-all duration-300 ease-in-out grid w-full overflow-hidden"
+        :class="
+          showDeleteSection
+            ? 'grid-rows-[1fr] opacity-100 mt-2'
+            : 'grid-rows-[0fr] opacity-0 mt-0'
+        "
+      >
+        <div class="overflow-hidden min-h-0">
+          <span class="inline-flex text-n-slate-11 text-sm items-center gap-1">
+            {{ t('CONTACTS_LAYOUT.CARD.DELETE_CONTACT.MESSAGE') }}
+            <Button
+              :label="t('CONTACTS_LAYOUT.CARD.DELETE_CONTACT.BUTTON')"
+              sm
+              ruby
+              link
+              @click="openConfirmDeleteContactDialog()"
+            />
+          </span>
+        </div>
+      </div>
+    </div>
+    <ConfirmContactDeleteDialog
+      ref="confirmDeleteContactDialogRef"
+      :selected-contact="selectedContact"
+    />
+  </Policy>
+</template>