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/modules/search/components/MessageContent.vue

@@ -0,0 +1,115 @@
+<script setup>
+import { computed } from 'vue';
+import { useI18n } from 'vue-i18n';
+import { useMessageFormatter } from 'shared/composables/useMessageFormatter';
+import { useExpandableContent } from 'shared/composables/useExpandableContent';
+
+const props = defineProps({
+  author: {
+    type: String,
+    default: '',
+  },
+  message: {
+    type: Object,
+    default: () => ({}),
+  },
+  searchTerm: {
+    type: String,
+    default: '',
+  },
+});
+
+const { t } = useI18n();
+const { highlightContent } = useMessageFormatter();
+
+const { contentElement, showReadMore, showReadLess, toggleExpanded } =
+  useExpandableContent();
+
+const messageContent = computed(() => {
+  // We perform search on either content or email subject or transcribed text
+  if (props.message.content) {
+    return props.message.content;
+  }
+
+  const { content_attributes = {} } = props.message;
+  const { email = {} } = content_attributes || {};
+  if (email.subject) {
+    return email.subject;
+  }
+
+  const audioAttachment = props.message.attachments?.find(
+    attachment => attachment.file_type === 'audio'
+  );
+  return audioAttachment?.transcribed_text || '';
+});
+
+const escapeHtml = html => {
+  const wrapper = document.createElement('p');
+  wrapper.textContent = html;
+  return wrapper.textContent;
+};
+
+const highlightedContent = computed(() => {
+  const content = messageContent.value || '';
+  const escapedText = escapeHtml(content);
+  return highlightContent(
+    escapedText,
+    props.searchTerm,
+    'searchkey--highlight'
+  );
+});
+
+const authorText = computed(() => {
+  const author = props.author || '';
+  const wroteText = t('SEARCH.WROTE');
+  return author ? `${author} ${wroteText} ` : '';
+});
+</script>
+
+<template>
+  <div
+    ref="contentElement"
+    class="break-words grid items-center text-n-slate-11 text-sm leading-relaxed"
+    :class="showReadMore ? 'grid-cols-[1fr_auto]' : 'grid-cols-1'"
+  >
+    <div
+      class="min-w-0"
+      :class="{
+        'overflow-hidden whitespace-nowrap text-ellipsis': showReadMore,
+      }"
+    >
+      <span v-if="authorText" class="text-n-slate-11 font-medium leading-4">{{
+        authorText
+      }}</span>
+      <span
+        v-dompurify-html="highlightedContent"
+        class="message-content text-n-slate-12 [&_.searchkey--highlight]:text-n-slate-12 [&_.searchkey--highlight]:font-semibold"
+      />
+      <button
+        v-if="showReadLess"
+        class="text-sm text-n-slate-11 underline cursor-pointer bg-transparent border-0 p-0 hover:text-n-slate-12 font-medium ltr:ml-0.5 rtl:mr-0.5"
+        @click.prevent="toggleExpanded(false)"
+      >
+        {{ t('SEARCH.READ_LESS') }}
+      </button>
+    </div>
+    <button
+      v-if="showReadMore"
+      class="text-sm text-n-slate-11 underline cursor-pointer bg-transparent border-0 p-0 hover:text-n-slate-12 font-medium justify-self-end ltr:ml-0.5 rtl:mr-0.5"
+      @click.prevent="toggleExpanded(true)"
+    >
+      {{ t('SEARCH.READ_MORE') }}
+    </button>
+  </div>
+</template>
+
+<style scoped lang="scss">
+.message-content :deep(p) {
+  @apply inline;
+  margin: 0;
+}
+
+.message-content :deep(br) {
+  display: none;
+}
+</style>