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/template-preview/QuickReplyTemplate.vue

@@ -0,0 +1,42 @@
+<script setup>
+import { computed } from 'vue';
+import Button from 'dashboard/components-next/button/Button.vue';
+import Icon from 'dashboard/components-next/icon/Icon.vue';
+
+const props = defineProps({
+  message: {
+    type: Object,
+    required: true,
+  },
+});
+
+const actions = computed(() => props.message.actions || []);
+</script>
+
+<template>
+  <div
+    class="rounded-xl divide-y bg-n-alpha-2 divide-n-strong text-n-slate-12 max-w-80"
+  >
+    <div class="p-3">
+      <span
+        v-dompurify-html="message.content"
+        class="text-sm font-medium prose prose-bubble"
+      />
+    </div>
+    <div
+      v-for="(action, index) in actions"
+      :key="index"
+      class="flex justify-center items-center p-3"
+    >
+      <Button
+        :label="action.title || action.text || 'Button'"
+        link
+        class="hover:!no-underline"
+      >
+        <template #icon>
+          <Icon icon="i-woot-quick-reply" class="size-[15px]" />
+        </template>
+      </Button>
+    </div>
+  </div>
+</template>