fix: Prevent template variables from becoming links (#10725)

# Pull Request Template

## Description

**Issue**
This PR fixes template variables in messages (e.g., {{customer.name}})
that were being incorrectly converted to clickable links by the
`MessageFormatter's linkify` functionality. This caused formatting
issues and broken links.

**Solution**
Added a `linkify` parameter to `MessageFormatter` to optionally disable
link conversion

## Type of change

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

## How Has This Been Tested?

**Screenshots**

**Before**
<img width="1012" alt="image"
src="https://github.com/user-attachments/assets/70abb238-b4d9-439d-9e51-c7513cf482fb"
/>


**After**
<img width="1012" alt="image"
src="https://github.com/user-attachments/assets/387acb74-674e-4b26-85cc-2d7190d256b1"
/>




## Checklist:

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [x] 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
- [x] 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/CampaignCard/CampaignCard.vue

@@ -98,7 +98,7 @@ const inboxIcon = computed(() => {
         </span>
       </div>
       <div
-        v-dompurify-html="formatMessage(message)"
+        v-dompurify-html="formatMessage(message, false, false, false)"
         class="text-sm text-n-slate-11 line-clamp-1 [&>p]:mb-0 h-6"
       />
       <div class="flex items-center w-full h-6 gap-2 overflow-hidden">