Shadcn Guideline: Form — Use Form with react-hook-form. Description: Integrate Form component with react-hook-form for validation. Do: useForm + Form + FormField pattern. Don't: Custom form handling without Form. Good Example: <Form {...form}><FormField control={form.control}>. Bad Example: <form onSubmit={handleSubmit}>. Severity: High. Docs: https://ui.shadcn.com/docs/components/form.