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/store/modules/conversations/index.js

@@ -204,6 +204,12 @@ export const mutations = {
     _state.allConversations.push(conversation);
   },
 
+  [types.DELETE_CONVERSATION](_state, conversationId) {
+    _state.allConversations = _state.allConversations.filter(
+      c => c.id !== conversationId
+    );
+  },
+
   [types.UPDATE_CONVERSATION](_state, conversation) {
     const { allConversations } = _state;
     const index = allConversations.findIndex(c => c.id === conversation.id);