feat: Unread Count: Frontend changes for showing unread count badges (3/3)[CW-6851] (#14372)

# Pull Request Template

## Description
This is the third and final PR in a series of PRs for Introducing unread
counts in the sidebar for inboxes and labels.

In this PR:
* Added frontend changes to show the badges for unread counts for
Inboxes and Labels
* Added specs for the changes

Issue:
https://linear.app/chatwoot/issue/CW-6851/support-unread-conversation-counts



## Type of change

Please delete options that are not relevant.

- [ ] Bug fix (non-breaking change which fixes an issue)
- [x] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality not to work as expected)
- [ ] This change requires a documentation update

## How Has This Been Tested?

Tested this locally. Cases to test:
* Send a message from the widget and see if the count changes
* Mark a conversation as unread and see the count change for inbox
* Open an unread conversation as agent and see the count go down
* Add a label to an unread conversation from sidebar right click action
without opening the conversation and see the count of un-reads on the
label change

Added the screenshot of how it will look like

<img width="614" height="990" alt="Screenshot 2026-05-05 at 7 00 11 PM"
src="https://github.com/user-attachments/assets/99fbaa9f-bcf2-4d8d-86e2-5727f652a9dd"
/>



## 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
- [x] 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

---------

Co-authored-by: Sojan Jose <sojan@pepalo.com>

app/javascript/dashboard/helper/actionCable.js

@@ -4,14 +4,18 @@ import DashboardAudioNotificationHelper from './AudioAlerts/DashboardAudioNotifi
 import { BUS_EVENTS } from 'shared/constants/busEvents';
 import { emitter } from 'shared/helpers/mitt';
 import { useImpersonation } from 'dashboard/composables/useImpersonation';
+import { FEATURE_FLAGS } from 'dashboard/featureFlags';
 
 const { isImpersonating } = useImpersonation();
+const UNREAD_COUNTS_REFETCH_THROTTLE_MS = 5000;
 
 class ActionCableConnector extends BaseActionCableConnector {
   constructor(app, pubsubToken) {
     const { websocketURL = '' } = window.chatwootConfig || {};
     super(app, pubsubToken, websocketURL);
     this.CancelTyping = [];
+    this.lastUnreadCountsFetchAt = null;
+    this.unreadCountsFetchTimer = null;
     this.events = {
       'message.created': this.onMessageCreated,
       'message.updated': this.onMessageUpdated,
@@ -32,6 +36,8 @@ class ActionCableConnector extends BaseActionCableConnector {
       'notification.updated': this.onNotificationUpdated,
       'conversation.read': this.onConversationRead,
       'conversation.updated': this.onConversationUpdated,
+      'conversation.unread_count_changed':
+        this.onConversationUnreadCountChanged,
       'account.cache_invalidated': this.onCacheInvalidate,
       'account.enrichment_completed': this.onEnrichmentCompleted,
       'copilot.message.created': this.onCopilotMessageCreated,
@@ -120,6 +126,56 @@ class ActionCableConnector extends BaseActionCableConnector {
     this.fetchConversationStats();
   };
 
+  onConversationUnreadCountChanged = () => {
+    this.throttledFetchConversationUnreadCounts();
+  };
+
+  throttledFetchConversationUnreadCounts = () => {
+    const now = Date.now();
+    const elapsedTime = now - this.lastUnreadCountsFetchAt;
+
+    if (
+      this.lastUnreadCountsFetchAt === null ||
+      elapsedTime >= UNREAD_COUNTS_REFETCH_THROTTLE_MS
+    ) {
+      this.clearUnreadCountsFetchTimer();
+      this.fetchConversationUnreadCounts();
+      return;
+    }
+
+    if (this.unreadCountsFetchTimer) return;
+
+    this.unreadCountsFetchTimer = setTimeout(() => {
+      this.unreadCountsFetchTimer = null;
+      this.fetchConversationUnreadCounts();
+    }, UNREAD_COUNTS_REFETCH_THROTTLE_MS - elapsedTime);
+  };
+
+  clearUnreadCountsFetchTimer = () => {
+    if (!this.unreadCountsFetchTimer) return;
+
+    clearTimeout(this.unreadCountsFetchTimer);
+    this.unreadCountsFetchTimer = null;
+  };
+
+  fetchConversationUnreadCounts = () => {
+    if (!this.isConversationUnreadCountsEnabled()) return;
+
+    this.lastUnreadCountsFetchAt = Date.now();
+    this.app.$store.dispatch('conversationUnreadCounts/get');
+  };
+
+  isConversationUnreadCountsEnabled = () => {
+    const accountId = this.app.$store.getters.getCurrentAccountId;
+    const isFeatureEnabled =
+      this.app.$store.getters['accounts/isFeatureEnabledonAccount'];
+
+    return isFeatureEnabled?.(
+      accountId,
+      FEATURE_FLAGS.CONVERSATION_UNREAD_COUNTS
+    );
+  };
+
   onTypingOn = ({ conversation, user }) => {
     const conversationId = conversation.id;