Constant MOBILE_RESIZER_STYLES 

pub const MOBILE_RESIZER_STYLES: &str = r#"
.panel-resizer {
    width: 6px;
    background: rgba(255, 255, 255, 0.05);
    cursor: col-resize;
    transition: background 0.2s ease;
    flex-shrink: 0;
}

.panel-resizer:hover,
.panel-resizer.active {
    background: rgba(102, 126, 234, 0.5);
}

@media (max-width: 768px) {
    .panel-resizer {
        display: none;
    }
}
"#;

On mobile, hide desktop resizers entirely