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>

assets/css/frontend.css

@@ -240,3 +240,85 @@
         grid-template-columns: 1fr;
     }
 }
+
+/* =========================================================================
+   Composable product page layout
+   ========================================================================= */
+
+/* Compact product header */
+.composable-product-header {
+    display: flex;
+    align-items: flex-start;
+    gap: 1.5rem;
+    padding: 1.5rem;
+    margin-bottom: 1.5rem;
+    background: #fff;
+    border: 1px solid #e0e0e0;
+    border-radius: 8px;
+}
+
+.composable-header-thumbnail {
+    flex-shrink: 0;
+}
+
+.composable-header-thumbnail img {
+    width: 100px;
+    height: 100px;
+    object-fit: cover;
+    border-radius: 6px;
+}
+
+.composable-header-info {
+    flex: 1;
+    min-width: 0;
+}
+
+.composable-product-layout .product_title {
+    margin: 0 0 0.5rem;
+    font-size: 1.5rem;
+    line-height: 1.3;
+}
+
+.composable-header-price {
+    margin-bottom: 0.5rem;
+    font-size: 1.1rem;
+    color: #2c3e50;
+    font-weight: 600;
+}
+
+.composable-header-description {
+    color: #666;
+    font-size: 0.95rem;
+    line-height: 1.5;
+}
+
+.composable-header-description p:last-child {
+    margin-bottom: 0;
+}
+
+/* Full-width selector area */
+.composable-selector-area {
+    margin-bottom: 2rem;
+}
+
+/* Override WooCommerce default product layout for composable products */
+.single-product-composable .composable-product-layout {
+    max-width: 100%;
+}
+
+.single-product-composable .composable-product-layout .wc-composable-product-selector {
+    max-width: 100%;
+}
+
+/* Responsive: stack header vertically on small screens */
+@media (max-width: 768px) {
+    .composable-product-header {
+        flex-direction: column;
+        align-items: center;
+        text-align: center;
+    }
+
+    .composable-product-layout .product_title {
+        font-size: 1.25rem;
+    }
+}