feat(nav): add anchor TOC in sidebar for toc-enabled pages

- Pass extracted anchors through template context
- Render anchor links under active page when page.toc is true
- Hierarchical indentation by heading level (h2-h6)
- CSS styling: smaller font, muted color, border-left indicator
- Add toc: true to templates.md as example

docs/content/features/templates.md

@@ -2,6 +2,7 @@
 title: Tera Templates
 description: Customizable templates without recompilation
 weight: 1
+toc: true
 ---
 
 sukr uses [Tera](https://tera.netlify.app/), a Jinja2-like templating engine. Templates are loaded at runtime, so you can modify them without recompiling sukr.

docs/static/style.css

@@ -111,6 +111,45 @@ body {
   font-size: 0.9rem;
 }
 
+/* Anchor navigation (TOC in sidebar) */
+.sidebar .nav-anchors {
+  margin-left: 1rem;
+  padding-left: 0.5rem;
+  border-left: 1px solid var(--border);
+  display: flex;
+  flex-direction: column;
+  gap: 0.125rem;
+  margin-top: 0.25rem;
+  margin-bottom: 0.25rem;
+}
+
+.sidebar .nav-anchors .anchor-link {
+  font-size: 0.8rem;
+  color: var(--fg-muted);
+  padding: 0.125rem 0;
+}
+
+.sidebar .nav-anchors .anchor-link:hover {
+  color: var(--accent);
+}
+
+/* Indent anchors by heading level */
+.sidebar .nav-anchors .level-3 {
+  margin-left: 0.5rem;
+}
+
+.sidebar .nav-anchors .level-4 {
+  margin-left: 1rem;
+}
+
+.sidebar .nav-anchors .level-5 {
+  margin-left: 1.5rem;
+}
+
+.sidebar .nav-anchors .level-6 {
+  margin-left: 2rem;
+}
+
 .sidebar-footer {
   margin-top: auto;
   padding-top: 1rem;

docs/templates/base.html

@@ -38,11 +38,25 @@
       {% set section_prefix = item.path | replace(from="index.html", to="") %}
       {% set is_current_section = page_path is starting_with(section_prefix) %}
       <a href="{{ prefix }}{{ item.path }}" {% if page_path==item.path %}class="active" {% endif %}>{{ item.label }}</a>
+      {% if page_path == item.path and page.toc and anchors %}
+      <div class="nav-anchors">
+        {% for anchor in anchors %}
+        <a href="#{{ anchor.id }}" class="anchor-link level-{{ anchor.level }}">{{ anchor.label }}</a>
+        {% endfor %}
+      </div>
+      {% endif %}
       {% if config.nested_nav and item.children %}
       <div class="nav-children{% if is_current_section %} expanded{% endif %}">
         {% for child in item.children %}
         <a href="{{ prefix }}{{ child.path }}" {% if page_path==child.path %}class="active" {% endif %}>{{ child.label
           }}</a>
+        {% if page_path == child.path and page.toc and anchors %}
+        <div class="nav-anchors">
+          {% for anchor in anchors %}
+          <a href="#{{ anchor.id }}" class="anchor-link level-{{ anchor.level }}">{{ anchor.label }}</a>
+          {% endfor %}
+        </div>
+        {% endif %}
         {% endfor %}
       </div>
       {% endif %}