feat: Allow users to mark a conversation as unread (#5924)

Allow users to mark conversations as unread.
Loom video: https://www.loom.com/share/ab70552d3c9c48b685da7dfa64be8bb3

fixes: #5552

Co-authored-by: Pranav Raj S <pranav@chatwoot.com>

app/javascript/dashboard/helper/specs/URLHelper.spec.js

@@ -29,6 +29,12 @@ describe('#URL Helpers', () => {
         '/app/accounts/1/team/1'
       );
     });
+
+    it('should return url to custom view', () => {
+      expect(conversationListPageURL({ accountId: 1, customViewId: 1 })).toBe(
+        '/app/accounts/1/custom_view/1'
+      );
+    });
   });
   describe('conversationUrl', () => {
     it('should return direct conversation URL if activeInbox is nil', () => {