Review submission form is present and accessible

Without a review submission form, buyers have no path to contribute social proof, and the store loses the user-generated content that drives conversion on product pages. Missing or incomplete forms also break schema.org AggregateRating eligibility, which strips star snippets from Google search results and reduces click-through. Shoppers who cannot review also cannot warn others about defects, so trust signals stagnate and repeat purchase rates drop.

Build a review submission form at components/ReviewForm.tsx exposing at minimum a 1-5 star rating input, a text area for the review body, and a submit button wired to a POST handler. Mount it on product pages or a dedicated /products/:id/review route, and render inline error and success states:

<form onSubmit={handleSubmit}>
  <StarInput value={rating} onChange={setRating} required />
  <textarea value={text} onChange={(e) => setText(e.target.value)} required />
  <button type="submit">Submit Review</button>
</form>