fix: Usability issues in conversation card context menu (#10971)

# Pull Request Template

## Description

The PR includes usability feedback fixes for the conversation card
context menu. A "Mark as Read" option has been added after "Mark as
Unread" to prevent misclicks due to shifting menu positions.
Additionally, a separator line has been introduced for better grouping
and clarity

#### **Orders**  
<img width="210" alt="image"
src="https://github.com/user-attachments/assets/d7c04356-7cfb-4f43-ac55-beb4167f91e9"
/>
<img width="210" alt="image"
src="https://github.com/user-attachments/assets/593acd58-39cf-4b25-b119-03b89cb3528c"
/>

**Fixes** https://linear.app/chatwoot/issue/CW-4088/usability-feedback

## Type of change

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

## How Has This Been Tested?

### **Loom video**

https://www.loom.com/share/59f8ad3bf4054b299bfcffc0ba24eca1?sid=98fbb67d-c3e9-4fa4-9b04-2a7cb3bf8568

## 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/ChatList.vue

@@ -675,6 +675,15 @@ async function markAsUnread(conversationId) {
     // Ignore error
   }
 }
+async function markAsRead(conversationId) {
+  try {
+    await store.dispatch('markMessagesRead', {
+      id: conversationId,
+    });
+  } catch (error) {
+    // Ignore error
+  }
+}
 async function onAssignTeam(team, conversationId = null) {
   try {
     await store.dispatch('assignTeam', {
@@ -744,6 +753,7 @@ provide('assignLabels', onAssignLabels);
 provide('updateConversationStatus', toggleConversationStatus);
 provide('toggleContextMenu', onContextMenuToggle);
 provide('markAsUnread', markAsUnread);
+provide('markAsRead', markAsRead);
 provide('assignPriority', assignPriority);
 provide('isConversationSelected', isConversationSelected);