Inject inline CSS into a page from Java

The @InlineStyleSheet annotation injects a CSS string into the page when the annotated component is attached. Use id to prevent duplicate injection across multiple component instances.

import com.webforj.annotation.InlineStyleSheet;
import com.webforj.component.Composite;
import com.webforj.component.html.elements.Div;
import com.webforj.router.annotation.Route;

@Route
@InlineStyleSheet(
  value = ".highlight {"
      + " background-color: var(--dwc-color-warning-alt);"
      + " color: var(--dwc-color-warning-text);"
      + " font-weight: var(--dwc-font-weight-semibold);"
      + " padding: var(--dwc-space-m);"
      + " }",
  id = "highlight-styles",
  once = true
)
public class MyView extends Composite<Div> {

  public MyView() {
    getBoundComponent().addClassName("highlight");
  }
}

With once = true, the style block is injected a single time, regardless of how many instances of the component are on the page at the same time.