Implement Phase 9 & reusable components; skip Phase 8 (emails)

Phase 8 (Emails) skipped: WooCommerce email rendering uses
wc_get_template_html() which bypasses the Twig pipeline entirely.
Email customization deferred to plugins or block email editor.

Phase 9 - Supplementary (7 templates):
- Brand description with thumbnail, taxonomy archive delegate
- Brands A-Z shortcode with alphabetical index navigation
- Single brand thumbnail shortcode
- REST API OAuth login and grant-access forms
- Back-in-stock notification form with email input

Reusable Components (6 templates):
- price: product price display with sale handling
- rating: star rating with Bootstrap Icons (filled/half/empty)
- address-card: billing/shipping address card with edit link
- status-badge: contextual order status badges
- quantity-input: +/- input group widget
- form-field: universal form field renderer (text/select/textarea/checkbox)

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

templates/brands/shortcodes/single-brand.html.twig

@@ -0,0 +1,24 @@
+{#
+ # Single Brand Thumbnail (Bootstrap 5 Override)
+ #
+ # Renders a single brand image link, used by [product_brand] shortcode.
+ #
+ # Expected context:
+ #   term      - WP_Term object for the brand
+ #   thumbnail - URL to brand thumbnail image
+ #   class     - CSS class for the image
+ #   width     - Image width
+ #   height    - Image height
+ #
+ # WooCommerce PHP equivalent: brands/shortcodes/single-brand.php
+ #
+ # @package WcBootstrap
+ # @since 0.1.0
+ #}
+
+<a href="{{ get_term_link(term, 'product_brand')|esc_url }}" class="d-inline-block">
+    <img src="{{ thumbnail|esc_url }}"
+         alt="{{ term.name|esc_attr }}"
+         class="{{ class|esc_attr }}"
+         style="width: {{ width|esc_attr }}; height: {{ height|esc_attr }};" />
+</a>