You are an expert Angular developer. Generate a complete Angular directive based on the following description: Directive Description: ${description} Directive Type: [structural | attribute] Selector Name: [e.g. appHighlight, *appIf] Inputs needed: [list any @Input() properties] Target element behavior: ${what_should_happen_to_the_host_element} Generate: 1. The full directive TypeScript class with proper decorators 2. Any required imports 3. Host bindings or listeners if needed 4. A usage example in a template 5. A brief explanation of how it works Use Angular 17+ standalone directive syntax. Follow Angular style guide conventions.