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/widgets/conversation/contextMenu/menuItem.vue

@@ -0,0 +1,72 @@
+<script setup>
+import Avatar from 'dashboard/components-next/avatar/Avatar.vue';
+import Icon from 'dashboard/components-next/icon/Icon.vue';
+
+defineProps({
+  option: {
+    type: Object,
+    default: () => {},
+  },
+  variant: {
+    type: String,
+    default: 'default',
+  },
+});
+</script>
+
+<template>
+  <div class="menu text-n-slate-12 min-h-7 min-w-0" role="button">
+    <fluent-icon
+      v-if="variant === 'icon' && option.icon"
+      :icon="option.icon"
+      size="14"
+      class="flex-shrink-0"
+    />
+    <span
+      v-if="
+        (variant === 'label' || variant === 'label-assigned') && option.color
+      "
+      class="label-pill flex-shrink-0"
+      :style="{ backgroundColor: option.color }"
+    />
+    <Avatar
+      v-if="variant === 'agent'"
+      :name="option.label"
+      :src="option.thumbnail"
+      :status="option.status === 'online' ? option.status : null"
+      :size="20"
+      class="flex-shrink-0"
+    />
+    <p class="menu-label truncate min-w-0 flex-1">
+      {{ option.label }}
+    </p>
+    <Icon
+      v-if="variant === 'label-assigned'"
+      icon="i-lucide-check"
+      class="flex-shrink-0 size-3.5 mr-1"
+    />
+  </div>
+</template>
+
+<style scoped lang="scss">
+.menu {
+  width: calc(6.25rem * 2);
+  @apply flex items-center flex-nowrap p-1 rounded-md overflow-hidden cursor-pointer;
+
+  .menu-label {
+    @apply my-0 mx-2 text-xs flex-shrink-0;
+  }
+
+  &:hover {
+    @apply bg-n-brand text-white;
+  }
+}
+
+.agent-thumbnail {
+  margin-top: 0 !important;
+}
+
+.label-pill {
+  @apply w-4 h-4 rounded-full border border-n-strong border-solid flex-shrink-0;
+}
+</style>