feat: Add rich template preview for WhatsApp & Twilio Templates (#13206)

This PR introduces a comprehensive, display-only template preview system
for both WhatsApp and Twilio templates rendering of all supported
template types.

This lays the foundation for rich template previews across:
- Template selection modals
- Campaign creation flows
- Message composer
- Message screen.

<img width="1818" height="2058" alt="template-preview"
src="https://github.com/user-attachments/assets/9833b28c-f824-4568-8f74-6da09ac61f62"
/>

---------

Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>
Co-authored-by: iamsivin <iamsivin@gmail.com>
Co-authored-by: Muhsin <12408980+muhsin-k@users.noreply.github.com>

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>