Offline Warning Test
Test the offline warning functionality
⚠️ OFFLINE MODE - Data is being saved locally only. Server connection failed!
🧪 Test Instructions
- Click "Show Offline Warning" to see the warning appear
- Click "Hide Offline Warning" to hide it
- Open the spreadsheet and try to edit a cell
- If the server is not running, the warning should appear automatically
- If the server is running, the warning should not appear