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/auth/form-login.html.twig

@@ -0,0 +1,69 @@
+{#
+ # REST API Auth Login Form (Bootstrap 5 Override)
+ #
+ # Login form for third-party app OAuth authentication.
+ # Rendered outside the WordPress theme (standalone page).
+ #
+ # Expected context:
+ #   app_name     - Name of the requesting application
+ #   return_url   - URL to return to on cancel
+ #   redirect_url - URL to redirect to after login
+ #
+ # WooCommerce PHP equivalent: auth/form-login.php
+ #
+ # @package WcBootstrap
+ # @since 0.1.0
+ #}
+
+{{ do_action('woocommerce_auth_page_header') }}
+
+<h1 class="h3 mb-4">
+    {{ __('%s would like to connect to your store')|format(app_name|esc_html) }}
+</h1>
+
+{{ wc_print_notices() }}
+
+<p class="mb-4">
+    {{ __('To connect to %1$s you need to be logged in. Log in to your store below, or <a href="%2$s">cancel and return to %1$s</a>')|format(app_name|esc_html, return_url|esc_url)|wp_kses_post }}
+</p>
+
+<form method="post" class="wc-auth-login">
+    <div class="mb-3">
+        <label for="username" class="form-label">
+            {{ __('Username or email address') }}&nbsp;<span class="text-danger" aria-hidden="true">*</span>
+            <span class="visually-hidden">{{ __('Required') }}</span>
+        </label>
+        <input type="text"
+               class="form-control"
+               name="username"
+               id="username"
+               required
+               aria-required="true" />
+    </div>
+
+    <div class="mb-3">
+        <label for="password" class="form-label">
+            {{ __('Password') }}&nbsp;<span class="text-danger" aria-hidden="true">*</span>
+            <span class="visually-hidden">{{ __('Required') }}</span>
+        </label>
+        <input type="password"
+               class="form-control"
+               name="password"
+               id="password"
+               required
+               aria-required="true" />
+    </div>
+
+    <div class="mt-3">
+        {{ wp_nonce_field('woocommerce-login', 'woocommerce-login-nonce') }}
+        <button type="submit"
+                class="btn btn-primary btn-lg"
+                name="login"
+                value="{{ __('Login') }}">
+            {{ __('Login') }}
+        </button>
+        <input type="hidden" name="redirect" value="{{ redirect_url|esc_url }}" />
+    </div>
+</form>
+
+{{ do_action('woocommerce_auth_page_footer') }}