SvelteKit Data Flow Quick Start Which file? Server-only (DB/secrets): | Universal (runs both): | API: Load decision: Need server resources? → server load | Need client APIs? → universal load Form actions: Always . Return for errors, throw to navigate, throw for failures. Example Reference Files - load-functions.md - Server vs universal - form-actions.md - Form handling patterns - serialization.md - What can/can't serialize - error-redirect-handling.md - fail/redirect/error - client-auth-invalidation.md - invalidateAll() after client-side auth Notes - Server load → universal load via param | A…