Svelte Guideline: Haptics — Use web-haptics for mobile feedback. Description: Haptic feedback on touch interactions is mandatory for mobile UIs. Do: trigger('success') on save; trigger('error') on validation failure. Don't: No haptic feedback on mobile interactions. Good Example: import { createWebHaptics } from 'web-haptics/svelte'. Bad Example: No tactile feedback on button press. Severity: High. Docs: https://github.com/nicholasgasior/web-haptics.