fix: Incorrect translation in contact merge modal and resolve z-index issue (#10943)

# Pull Request Template

## Description

This PR includes fix for,

**1**. Incorrect error message translation for search in contact merge
modal.
<img width="395" alt="image"
src="https://github.com/user-attachments/assets/e6592bcc-4656-4a6e-83a9-7124e2c4732a"
/>


**2**. Z-index issue in chat screen
<img width="395" alt="image"
src="https://github.com/user-attachments/assets/387a2b47-ea85-49c7-832b-8bc1a4f0ec3f"
/>


## Type of change

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

## How Has This Been Tested?

**Screenshots**
**1.** 
<img width="395" alt="image"
src="https://github.com/user-attachments/assets/a1f1e36d-0801-4e7b-9ee9-c72728933332"
/>
**2.** 
<img width="395" alt="image"
src="https://github.com/user-attachments/assets/60a0ddc1-eb8f-4dbc-9028-245e6bb64c33"
/>



## 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/message/bubbles/BaseAttachment.vue

@@ -31,7 +31,7 @@ const senderName = computed(() => {
 <template>
   <BaseBubble class="overflow-hidden p-3" data-bubble-name="attachment">
     <div class="grid gap-4 min-w-64">
-      <div class="grid gap-3 z-20">
+      <div class="grid gap-3">
         <div
           class="size-8 rounded-lg grid place-content-center"
           :class="iconBgColor"

app/javascript/dashboard/i18n/locale/en/contact.json

@@ -266,7 +266,7 @@
       "ATTRIBUTE_WARNING": "Contact details of <strong>{primaryContactName}</strong> will be copied to <strong>{parentContactName}</strong>."
     },
     "SEARCH": {
-      "ERROR": "ERROR_MESSAGE"
+      "ERROR_MESSAGE": "Something went wrong. Please try again later."
     },
     "FORM": {
       "SUBMIT": " Merge contacts",