fix: Styles issues with conversation card (#12107)

# Pull Request Template

## Description

This PR includes the following changes:

1. Fixes a couple of UI issues.
2. Moves all styles to inline classes.
3. Migrates the `ConversationCard.vue` component from the Options API to
the Composition API.


## Type of change

- [x] Bug fix (non-breaking change which fixes an issue)

## How Has This Been Tested?

### Screenshots
**Before**
<img width="353" height="550" alt="image"
src="https://github.com/user-attachments/assets/070c9bf1-6077-48d8-832d-79037b794f42"
/>



**After**
<img width="353" height="541" alt="image"
src="https://github.com/user-attachments/assets/c54bf69c-d175-45cf-a6fe-9c7ab6f66226"
/>


## Checklist:

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [ ] I have commented on my code, particularly in hard-to-understand
areas
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [x] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream
modules

app/javascript/dashboard/components-next/Campaigns/Pages/CampaignPage/WhatsAppCampaign/WhatsAppCampaignDialog.vue

@@ -38,11 +38,13 @@ const handleClose = () => emit('close');
 
 <template>
   <div
-    class="w-[25rem] z-50 min-w-0 absolute top-10 ltr:right-0 rtl:left-0 bg-n-alpha-3 backdrop-blur-[100px] p-6 rounded-xl border border-n-weak shadow-md flex flex-col gap-6"
+    class="w-[25rem] z-50 min-w-0 absolute top-10 ltr:right-0 rtl:left-0 bg-n-alpha-3 backdrop-blur-[100px] rounded-xl border border-n-weak shadow-md max-h-[80vh] overflow-y-auto"
   >
-    <h3 class="text-base font-medium text-n-slate-12">
-      {{ t(`CAMPAIGN.WHATSAPP.CREATE.TITLE`) }}
-    </h3>
-    <WhatsAppCampaignForm @submit="handleSubmit" @cancel="handleClose" />
+    <div class="p-6 flex flex-col gap-6">
+      <h3 class="text-base font-medium text-n-slate-12 flex-shrink-0">
+        {{ t(`CAMPAIGN.WHATSAPP.CREATE.TITLE`) }}
+      </h3>
+      <WhatsAppCampaignForm @submit="handleSubmit" @cancel="handleClose" />
+    </div>
   </div>
 </template>