chore(storefront): remove dead cart email-capture markup and CSS

Post-payment email/phone-capture form in cart.component.html was
commented-out markup (never rendered), with a matching ~90-line dead
.email-form CSS block still shipping in the bundle. Removed both.
Closes KNOWN-ISSUES.md item 10.

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

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

@@ -263,58 +263,6 @@
         <div class="payment-status-screen success">
           <div class="success-icon" aria-hidden="true">✓</div>
           <h2>{{ 'cart.paymentSuccess' | translate }}</h2>
-          <!-- <p class="success-text">{{ 'cart.paymentSuccessDesc' | translate }}</p> -->
-          
-          <!-- <div class="email-form">
-            <div class="input-group">
-              <input 
-                type="email" 
-                class="email-input" 
-                [class.valid]="emailTouched() && !emailError()"
-                [class.invalid]="emailTouched() && emailError()"
-                placeholder="your@email.com"
-                [value]="userEmail()"
-                (input)="onEmailInput($event)"
-                (blur)="onEmailBlur()"
-                [disabled]="emailSubmitting()"
-                maxlength="100"
-              />
-              @if (emailTouched() && emailError()) {
-                <div class="error-message">{{ emailError() }}</div>
-              }
-            </div>
-            
-            <div class="input-group">
-              <input 
-                type="tel" 
-                class="email-input phone-input" 
-                [class.valid]="phoneTouched() && !phoneError()"
-                [class.invalid]="phoneTouched() && phoneError()"
-                placeholder="+7 (900) 123-45-67"
-                [value]="userPhone()"
-                (input)="onPhoneInput($event)"
-                (blur)="onPhoneBlur()"
-                [disabled]="emailSubmitting()"
-                (keyup.enter)="submitEmail()"
-              />
-              @if (phoneTouched() && phoneError()) {
-                <div class="error-message">{{ phoneError() }}</div>
-              }
-            </div>
-            
-            <button 
-              class="submit-email-btn" 
-              (click)="submitEmail()"
-              [disabled]="emailSubmitting()"
-            >
-              @if (emailSubmitting()) {
-                <span class="spinner-small"></span>
-                {{ 'cart.sending' | translate }}
-              } @else {
-                {{ 'cart.send' | translate }}
-              }
-            </button>
-          </div> -->
         </div>
       }
 

src/app/pages/cart/cart.component.scss

@@ -1010,100 +1010,6 @@
   }
 }
 
-.email-form {
-  display: flex;
-  flex-direction: column;
-  gap: 16px;
-  margin-top: 24px;
-
-  .input-group {
-    display: flex;
-    flex-direction: column;
-    gap: 6px;
-  }
-
-  .error-message {
-    color: var(--error-color);
-    font-size: var(--font-size-base, 0.875rem);
-    padding-left: 4px;
-    animation: slideDown 0.2s ease;
-  }
-
-  @keyframes slideDown {
-    from {
-      opacity: 0;
-      transform: translateY(-4px);
-    }
-    to {
-      opacity: 1;
-      transform: translateY(0);
-    }
-  }
-
-  .email-input {
-    width: 100%;
-    padding: 14px;
-    border: 1px solid #e5e7eb;
-    border-radius: var(--radius-sm, 8px);
-    font-size: var(--font-size-lg, 1rem);
-    outline: none;
-    transition: all 0.2s;
-
-    &:focus {
-      border-color: var(--primary-color);
-      box-shadow: 0 0 0 3px rgba(73, 118, 113, 0.1);
-    }
-
-    &.valid {
-      border-color: #10b981;
-      background-color: #f0fdf4;
-      
-      &:focus {
-        border-color: #10b981;
-        box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
-      }
-    }
-
-    &.invalid {
-      border-color: #ef4444;
-      background-color: #fef2f2;
-      
-      &:focus {
-        border-color: #ef4444;
-        box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
-      }
-    }
-  }
-
-  .submit-email-btn {
-    padding: 14px;
-    background: var(--primary-color);
-    color: white;
-    border: none;
-    border-radius: var(--radius-lg, 13px);
-    font-family: "DM Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
-    font-size: var(--font-size-lg, 1rem);
-    font-weight: var(--font-weight-bold, 700);
-    cursor: pointer;
-    display: flex;
-    align-items: center;
-    justify-content: center;
-    gap: 8px;
-    transition: all 0.2s;
-
-    &:hover:not(:disabled) {
-      background: var(--primary-hover);
-      transform: translateY(-1px);
-      box-shadow: 0 4px 12px rgba(73, 118, 113, 0.3);
-    }
-
-    &:disabled {
-      opacity: 0.6;
-      cursor: not-allowed;
-    }
-  }
-}
-
 // Mobile responsive
 @media (max-width: 768px) {
   .cart-content {