## Checkbox / task completion check

- Use case: Checking off a to-do item: a light tick on check, and nothing (or lighter) on uncheck.
- Feel: A small satisfying pop when completing; unchecking is quieter to feel like an undo.
- APIs: .sensoryFeedback(.impact(weight: .light))
- Minimum OS: iOS 17+ / iOS 13+

### SwiftUI (iOS 17+)

```swift
import SwiftUI

struct TaskRow: View {
    @State private var done = false
    let title: String

    var body: some View {
        Button {
            withAnimation(.snappy) { done.toggle() }
        } label: {
            HStack {
                Image(systemName: done ? "checkmark.circle.fill" : "circle")
                    .foregroundStyle(done ? .green : .secondary)
                Text(title)
                    .strikethrough(done, color: .secondary)
            }
        }
        // Pop on completion only; unchecking stays silent
        .sensoryFeedback(trigger: done) { _, isDone in
            isDone ? .impact(weight: .light, intensity: 0.8) : nil
        }
    }
}
```

### Notes
- Returning nil from the closure form is the cleanest way to express "haptic in one direction only".