Svelte Guideline: UX Principles — Apply signifiers for discoverability. Description: Visual cues so users don't discover features by accident. Do: Tooltip on hover; placeholder in empty state; animation on draggable. Don't: Hidden features requiring accidental discovery. Good Example: <Tooltip>Drag to reorder</Tooltip> on drag handle. Bad Example: Drag handle with no visual affordance. Severity: Medium. Docs: .