Add custom page template for composable products, bump to v1.3.2

- Custom WooCommerce template with compact header + full-width selector
- Twig layout template (single-product-composable.html.twig) + PHP loader
- Body class 'single-product-composable' for CSS scoping
- Renamed *.twig to *.html.twig (proper naming convention)
- Refreshed .pot with accurate file refs, merged all .po files

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

templates/single-product-composable.html.twig

@@ -0,0 +1,37 @@
+{# Custom single product template for composable products #}
+<div id="product-{{ product_id }}" class="{{ product_class }}">
+
+    {# Compact product header — replaces the large image gallery #}
+    <div class="composable-product-header">
+        {% if image_html %}
+        <div class="composable-header-thumbnail">
+            {{ image_html|raw }}
+        </div>
+        {% endif %}
+
+        <div class="composable-header-info">
+            <h1 class="product_title entry-title">{{ product_name|esc_html }}</h1>
+
+            {% if price_html %}
+            <div class="composable-header-price price">
+                {{ price_html|raw }}
+            </div>
+            {% endif %}
+
+            {% if short_description %}
+            <div class="composable-header-description">
+                {{ short_description|raw }}
+            </div>
+            {% endif %}
+        </div>
+    </div>
+
+    {# Full-width product selector #}
+    <div class="composable-selector-area">
+        {{ selector_html|raw }}
+    </div>
+
+    {# WooCommerce after-summary content (tabs, related products) #}
+    {{ after_summary_html|raw }}
+
+</div>