Svelte Guideline: Forms — Use Superforms + Formsnap for forms. Description: Server-validated forms with Superforms and Formsnap UI bindings. Do: superForm(data.form, { validators: valibotClient(schema) }). Don't: Manual form state management. Good Example: <Form.Field {form} name='email'><Form.Control>...</Form.Control></Form.Field>. Bad Example: <input bind:value={email} on:blur={validate}>. Severity: High. Docs: https://superforms.rocks.