Implement Phase 4 & 5: cart and checkout templates (Bootstrap 5, HPOS)

Phase 4 - Cart (9 templates):
- cart: 8+4 column layout, table-responsive items, coupon input-group
- cart-empty: centered empty state with cart-x icon
- cart-item-data: inline dl for variation details
- cart-totals: card with list-group-flush rows, sticky sidebar
- cart-shipping: form-check radio per shipping method
- cross-sells: product loop grid section
- mini-cart: offcanvas-compatible item list with remove buttons
- proceed-to-checkout-button: btn-primary btn-lg w-100
- shipping-calculator: collapsible form with form-select/form-control

Phase 5 - Checkout (12 templates):
- form-checkout: 7+5 column layout, sticky order review sidebar
- form-billing: card with field wrapper, optional account creation
- form-shipping: card with ship-to-different-address collapse toggle
- form-coupon: collapsible input-group with alert-info toggle
- form-login: collapsible login reusing global/form-login.html.twig
- review-order: card with table-sm, tfoot subtotal/shipping/total
- payment: list-group of payment gateways with radio selection
- payment-method: form-check with description collapse
- terms: form-check checkbox with T&C link
- thankyou: HPOS compatible, alert-success + order details list-group
- order-received: confirmation message
- cart-errors: alert-danger with return-to-cart button

All order data accessed via WC_Order methods (HPOS compatible).
CSS additions: cart thumbnail sizing, checkout form field overrides,
payment box transitions, dark mode focus states.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

templates/checkout/review-order.html.twig

@@ -0,0 +1,91 @@
+{#
+ # Order Review Table (Bootstrap 5 Override)
+ #
+ # Renders the order summary table during checkout.
+ #
+ # Expected context:
+ #   cart_items    - Array of cart items for review
+ #   cart_subtotal - Subtotal HTML
+ #   cart_total    - Total HTML
+ #   coupons       - Applied coupons
+ #   fees          - Fees
+ #
+ # WooCommerce PHP equivalent: checkout/review-order.php
+ #
+ # @package WcBootstrap
+ # @since 0.1.0
+ #}
+
+<div class="card shadow-sm woocommerce-checkout-review-order-table">
+    <div class="card-body p-0">
+        <table class="table table-sm mb-0 shop_table woocommerce-checkout-review-order-table">
+            <thead class="table-light">
+                <tr>
+                    <th class="product-name" scope="col">{{ __('Product') }}</th>
+                    <th class="product-total text-end" scope="col">{{ __('Subtotal') }}</th>
+                </tr>
+            </thead>
+            <tbody>
+                {{ do_action('woocommerce_review_order_before_cart_contents') }}
+
+                {% if cart_items is defined %}
+                    {% for item in cart_items %}
+                        <tr class="cart_item">
+                            <td class="product-name">
+                                {{ item.product_name|esc_html }}
+                                <strong class="product-quantity text-body-secondary">&times;&nbsp;{{ item.quantity }}</strong>
+                                {{ item.item_data_html|default('')|raw }}
+                            </td>
+                            <td class="product-total text-end">
+                                {{ item.subtotal|raw }}
+                            </td>
+                        </tr>
+                    {% endfor %}
+                {% endif %}
+
+                {{ do_action('woocommerce_review_order_after_cart_contents') }}
+            </tbody>
+            <tfoot>
+                <tr class="cart-subtotal">
+                    <th scope="row">{{ __('Subtotal') }}</th>
+                    <td class="text-end">{{ cart_subtotal|raw }}</td>
+                </tr>
+
+                {% if coupons is defined %}
+                    {% for coupon in coupons %}
+                        <tr class="cart-discount coupon-{{ coupon.code|esc_attr }}">
+                            <th scope="row">{{ __('Coupon:') }} {{ coupon.code|esc_html }}</th>
+                            <td class="text-end">{{ coupon.discount_html|raw }}</td>
+                        </tr>
+                    {% endfor %}
+                {% endif %}
+
+                {{ do_action('woocommerce_review_order_before_shipping') }}
+
+                {% if wc_shipping_enabled() is defined and wc_shipping_enabled() %}
+                    {{ do_action('woocommerce_review_order_shipping') }}
+                {% endif %}
+
+                {{ do_action('woocommerce_review_order_after_shipping') }}
+
+                {% if fees is defined %}
+                    {% for fee in fees %}
+                        <tr class="fee">
+                            <th scope="row">{{ fee.name|esc_html }}</th>
+                            <td class="text-end">{{ fee.total_html|raw }}</td>
+                        </tr>
+                    {% endfor %}
+                {% endif %}
+
+                {{ do_action('woocommerce_review_order_before_order_total') }}
+
+                <tr class="order-total">
+                    <th scope="row" class="fw-bold">{{ __('Total') }}</th>
+                    <td class="text-end fw-bold fs-5">{{ cart_total|raw }}</td>
+                </tr>
+
+                {{ do_action('woocommerce_review_order_after_order_total') }}
+            </tfoot>
+        </table>
+    </div>
+</div>