fix: cart email/phone capture form was never rendered

recordOrder() and autoSubmitPurchase() read userEmail()/userPhone()
signals and submitEmail() was fully implemented (validation, error
handling), but the success screen's template never rendered the
inputs - so the form was unreachable and the fallback auto-submit
always sent blank email/phone.

- Added the email/phone form to the payment-success screen, wired to
  the existing signals/handlers.
- autoSubmitPurchase() (the 5s fallback if the user doesn't submit
  manually) no longer navigates home via an unconditional setTimeout(0)
  fired before the submission result is known - it now waits for
  submitPurchaseEmail() to settle, same as the manual path, and skips
  entirely if the user already submitted (new purchaseSubmitted flag).
- It also now sends whatever the user has typed instead of
  hardcoded-blank fields, and shows a toast instead of only logging to
  console when no Telegram user id is available.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/app/pages/cart/cart.component.html

@@ -271,6 +271,44 @@
         <div class="payment-status-screen success" role="status" aria-live="polite">
           <div class="success-icon" aria-hidden="true">✓</div>
           <h2>{{ 'cart.paymentSuccess' | translate }}</h2>
+          @if (!purchaseSubmitted()) {
+            <p>{{ 'cart.paymentSuccessDesc' | translate }}</p>
+            <form class="contact-capture-form" (ngSubmit)="submitEmail()">
+              <label>
+                <input
+                  type="email"
+                  name="email"
+                  [value]="userEmail()"
+                  [placeholder]="'cart.emailPlaceholder' | translate"
+                  [attr.aria-invalid]="!!emailError()"
+                  (input)="onEmailInput($event)"
+                  (blur)="onEmailBlur()"
+                  [disabled]="emailSubmitting()"
+                />
+                @if (emailError()) {
+                  <span class="field-error">{{ emailError() }}</span>
+                }
+              </label>
+              <label>
+                <input
+                  type="tel"
+                  name="phone"
+                  [value]="userPhone()"
+                  [placeholder]="'cart.phonePlaceholder' | translate"
+                  [attr.aria-invalid]="!!phoneError()"
+                  (input)="onPhoneInput($event)"
+                  (blur)="onPhoneBlur()"
+                  [disabled]="emailSubmitting()"
+                />
+                @if (phoneError()) {
+                  <span class="field-error">{{ phoneError() }}</span>
+                }
+              </label>
+              <button type="submit" [disabled]="emailSubmitting()">
+                {{ emailSubmitting() ? ('cart.sending' | translate) : ('cart.send' | translate) }}
+              </button>
+            </form>
+          }
         </div>
       }