Checkout not blocked by unnecessary account fields

Every required field that isn't essential for fulfillment is a chance for the shopper to abandon. Asking for company name, middle name, birthday, or newsletter opt-in as mandatory fields on a one-time purchase is a self-inflicted conversion cut. Baymard's checkout benchmark sets the median essential-field count near seven — forms demanding twelve required fields underperform the median by a wide margin, and the damage is concentrated on mobile where each extra tap compounds.

In src/components/CheckoutForm.tsx, mark only name, email, shipping address lines, city, region, postal code, country, and phone as required. Drop required from company, middle name, birthday, newsletter, and "how did you hear about us." Move opt-ins to unchecked checkboxes.

<input name="name" required />
<input name="email" type="email" required />
<input name="company" /> {/* optional */}
<label><input type="checkbox" /> Subscribe to newsletter</label>