fix: Handle emoji and special characters in mention notifications (#11857)

Fixes notification display issues when user or team names contain emojis
and special characters. Previously, mention notifications would show
URL-encoded characters instead of properly formatted names with emojis.

  **Before:**
Notification: "John Doe: Hey @%F0%9F%91%8D%20customer%20support please
check this"

  **After:**
  Notification: "John Doe: Hey @👍 customer support please check this"

spec/helpers/message_format_helper_spec.rb

@@ -3,9 +3,37 @@ require 'rails_helper'
 describe MessageFormatHelper do
   describe '#transform_user_mention_content' do
     context 'when transform_user_mention_content called' do
-      it 'return transormed text correctly' do
+      it 'return transformed text correctly' do
         expect(helper.transform_user_mention_content('[@john](mention://user/1/John%20K), check this ticket')).to eq '@john, check this ticket'
       end
+
+      it 'handles emoji in display names correctly' do
+        content = '[@👍 customer support](mention://team/1/%F0%9F%91%8D%20customer%20support), please help'
+        expected = '@👍 customer support, please help'
+        expect(helper.transform_user_mention_content(content)).to eq expected
+      end
+
+      it 'handles multiple mentions with emojis and spaces' do
+        content = 'Hey [@John Doe](mention://user/1/John%20Doe) and [@🚀 Dev Team](mention://team/2/%F0%9F%9A%80%20Dev%20Team)'
+        expected = 'Hey @John Doe and @🚀 Dev Team'
+        expect(helper.transform_user_mention_content(content)).to eq expected
+      end
+
+      it 'handles emoji-only team names' do
+        expect(helper.transform_user_mention_content('[@🔥](mention://team/3/%F0%9F%94%A5) urgent')).to eq '@🔥 urgent'
+      end
+
+      it 'handles special characters in names' do
+        expect(helper.transform_user_mention_content('[@user@domain.com](mention://user/4/user%40domain.com) check')).to eq '@user@domain.com check'
+      end
+
+      it 'returns empty string for nil content' do
+        expect(helper.transform_user_mention_content(nil)).to eq ''
+      end
+
+      it 'returns empty string for empty content' do
+        expect(helper.transform_user_mention_content('')).to eq ''
+      end
     end
   end
 

spec/models/notification_spec.rb

@@ -128,6 +128,39 @@ has been assigned to you"
       expect(notification.push_message_body).to eq "#{message.sender.name}: Hey @John Peter please check this?"
     end
 
+    it 'returns appropriate body suited for the notification type conversation_mention if username contains emoji' do
+      conversation = create(:conversation)
+      content = 'Hey [@👍 customer support](mention://team/1/%F0%9F%91%8D%20customer%20support) please check this?'
+      message = create(:message, sender: create(:user), content: content, conversation: conversation)
+      notification = create(:notification, notification_type: 'conversation_mention', primary_actor: conversation, secondary_actor: message)
+      expect(notification.push_message_body).to eq "#{message.sender.name}: Hey @👍 customer support please check this?"
+    end
+
+    it 'returns appropriate body suited for the notification type conversation_mention if team name contains emoji and spaces' do
+      conversation = create(:conversation)
+      content = 'Please check [@🚀 Development Team](mention://team/2/%F0%9F%9A%80%20Development%20Team)'
+      message = create(:message, sender: create(:user), content: content, conversation: conversation)
+      notification = create(:notification, notification_type: 'conversation_mention', primary_actor: conversation, secondary_actor: message)
+      expect(notification.push_message_body).to eq "#{message.sender.name}: Please check @🚀 Development Team"
+    end
+
+    it 'returns appropriate body suited for the notification type conversation_mention with mixed emoji and regular mentions' do
+      conversation = create(:conversation)
+      content = 'Hey [@John Doe](mention://user/1/John%20Doe) and ' \
+                '[@👍 customer support](mention://team/1/%F0%9F%91%8D%20customer%20support) please review'
+      message = create(:message, sender: create(:user), content: content, conversation: conversation)
+      notification = create(:notification, notification_type: 'conversation_mention', primary_actor: conversation, secondary_actor: message)
+      expect(notification.push_message_body).to eq "#{message.sender.name}: Hey @John Doe and @👍 customer support please review"
+    end
+
+    it 'returns appropriate body suited for the notification type conversation_mention with special characters in names' do
+      conversation = create(:conversation)
+      content = 'Please review [@user@domain.com](mention://user/4/user%40domain.com)'
+      message = create(:message, sender: create(:user), content: content, conversation: conversation)
+      notification = create(:notification, notification_type: 'conversation_mention', primary_actor: conversation, secondary_actor: message)
+      expect(notification.push_message_body).to eq "#{message.sender.name}: Please review @user@domain.com"
+    end
+
     it 'calls remove duplicate notification job' do
       allow(Notification::RemoveDuplicateNotificationJob).to receive(:perform_later)
       notification = create(:notification, notification_type: 'conversation_mention')