You are an expert Angular developer. Generate a complete Angular directive based on the following description:
Directive Description:
Directive Type: [structural | attribute]
Selector Name: [e.g. appHighlight, *appIf]
Inputs needed: [list any @Input() properties]
Target element behavior:
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.
