Add product category tree sidebar to archive and single product pages (v0.1.7)

Hierarchical category navigation with collapsible sub-levels up to 3 levels
deep, using Bootstrap 5 list-group and collapse components. Sidebar renders
on both archive/shop and single product pages with responsive offcanvas on
mobile. Active category highlighting and ancestor auto-expand for intuitive
navigation.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

CHANGELOG.md

@@ -2,6 +2,20 @@
 
 All notable changes to this project will be documented in this file.
 
+## [0.1.7] - 2026-03-29
+
+### Added
+
+- **Product category tree sidebar** on archive/shop and single product pages: hierarchical navigation with collapsible sub-levels up to 3 levels deep, using Bootstrap 5 list-group and collapse components
+- **`wc_bootstrap_get_category_tree()`** (`functions.php`): Builds nested category array with `is_active`/`is_ancestor` flags for current page context, parent-indexed lookup for O(n) tree construction
+- **Category tree Twig templates** (`global/category-tree.html.twig`, `global/category-tree-node.html.twig`): Recursive rendering with "All products" link, product count badges, chevron toggle buttons, and `aria-current="page"` accessibility
+- **Single product sidebar** (`woocommerce/single-product.php`): Added responsive sidebar layout (`col-lg-3` + `col-lg-9`) with offcanvas on mobile, matching the archive page pattern
+- **Category tree CSS** (`wc-bootstrap.css`): Hover states, active highlighting (primary color), chevron rotation animation, nested indentation, dark mode compatible via Bootstrap CSS variables
+
+### Changed
+
+- **Archive sidebar always visible** (`woocommerce/archive-product.php`): Sidebar now renders when categories exist, not only when widgets are configured. Category tree renders above any widgets.
+
 ## [0.1.6] - 2026-03-01
 
 ### Added