feat: Allow removing labels via conversation context menu (#13525)

# Pull Request Template

## Description

This PR adds support for removing labels from the conversation card
context menu. Assigned labels now show a checkmark, and clicking an
already-selected label will remove it.

Fixes
https://linear.app/chatwoot/issue/CW-6400/allow-removing-labels-directly-from-the-right-click-menu
https://github.com/chatwoot/chatwoot/issues/13367
## Type of change

- [x] New feature (non-breaking change which adds functionality)

## How Has This Been Tested?

**Screencast**


https://github.com/user-attachments/assets/4e3a6080-a67d-4851-9d10-d8dbf3ceeb04




## 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
- [ ] 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/widgets/conversation/ConversationCard.vue

@@ -34,6 +34,7 @@ const emit = defineEmits([
   'contextMenuToggle',
   'assignAgent',
   'assignLabel',
+  'removeLabel',
   'assignTeam',
   'markAsUnread',
   'markAsRead',
@@ -203,7 +204,10 @@ const onAssignAgent = agent => {
 
 const onAssignLabel = label => {
   emit('assignLabel', [label.title], [props.chat.id]);
-  closeContextMenu();
+};
+
+const onRemoveLabel = label => {
+  emit('removeLabel', [label.title], [props.chat.id]);
 };
 
 const onAssignTeam = team => {
@@ -379,11 +383,13 @@ const deleteConversation = () => {
         :priority="chat.priority"
         :chat-id="chat.id"
         :has-unread-messages="hasUnread"
+        :conversation-labels="chat.labels"
         :conversation-url="conversationPath"
         :allowed-options="allowedContextMenuOptions"
         @update-conversation="onUpdateConversation"
         @assign-agent="onAssignAgent"
         @assign-label="onAssignLabel"
+        @remove-label="onRemoveLabel"
         @assign-team="onAssignTeam"
         @mark-as-unread="markAsUnread"
         @mark-as-read="markAsRead"