Svelte Guideline: Haptics — Always pair haptic with visual feedback. Description: Haptics alone invisible on desktop; visual alone misses mobile tactile. Do: trigger('error') + toast.error('Failed'). Don't: Haptic-only or visual-only feedback. Good Example: trigger('success'); toast.success('Saved'). Bad Example: trigger('success') without toast. Severity: Medium. Docs: .