feat: Add conversation delete feature (#11677)

<img width="1240" alt="Screenshot 2025-06-05 at 12 39 04 AM"
src="https://github.com/user-attachments/assets/0071cd23-38c3-4638-946e-f1fbd11ec845"
/>


## Changes

Give the admins an option to delete conversation via the context menu

- enable conversation deletion in routes and controller
- expose delete API on conversations
- add delete option in conversation context menu and integrate with card
and list
- implement store action and mutation for delete
- update i18n with new strings

fixes: https://github.com/chatwoot/chatwoot/issues/947

---------

Co-authored-by: iamsivin <iamsivin@gmail.com>
Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>
Co-authored-by: Pranav <pranavrajs@gmail.com>

app/javascript/dashboard/components/ConversationItem.vue

@@ -16,6 +16,7 @@ export default {
     'markAsRead',
     'assignPriority',
     'isConversationSelected',
+    'deleteConversation',
   ],
   props: {
     source: {
@@ -67,5 +68,6 @@ export default {
     @mark-as-unread="markAsUnread"
     @mark-as-read="markAsRead"
     @assign-priority="assignPriority"
+    @delete-conversation="deleteConversation"
   />
 </template>