v0.1.1 - Bootstrap frontend rendering via Twig templates

Replace FSE block markup on the frontend with proper Bootstrap 5 HTML
rendered through Twig templates. The Site Editor remains functional for
admin editing while the public site outputs Bootstrap navbar, cards,
pagination, grid layout, and responsive components.

New PHP classes: TemplateController, ContextBuilder, NavWalker
New Twig templates: 20 files (base, pages, partials, components)
Enhanced TwigService with WordPress functions and globals

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

views/partials/header.html.twig

@@ -0,0 +1,56 @@
+<header>
+    <nav class="navbar navbar-expand-lg bg-body-tertiary">
+        <div class="container">
+            <a class="navbar-brand fw-bold" href="{{ site.url }}">
+                {{ site.name }}
+            </a>
+
+            <button class="navbar-toggler" type="button"
+                    data-bs-toggle="collapse" data-bs-target="#navbarMain"
+                    aria-controls="navbarMain" aria-expanded="false"
+                    aria-label="{{ __('Toggle navigation') }}">
+                <span class="navbar-toggler-icon"></span>
+            </button>
+
+            <div class="collapse navbar-collapse" id="navbarMain">
+                <ul class="navbar-nav ms-auto mb-2 mb-lg-0">
+                    {% for item in menu %}
+                        {% if item.children|length > 0 %}
+                            <li class="nav-item dropdown">
+                                <a class="nav-link dropdown-toggle{{ item.active ? ' active' : '' }}"
+                                   href="{{ item.url }}" role="button"
+                                   data-bs-toggle="dropdown" aria-expanded="false">
+                                    {{ item.title }}
+                                </a>
+                                <ul class="dropdown-menu">
+                                    {% for child in item.children %}
+                                        <li>
+                                            <a class="dropdown-item{{ child.active ? ' active' : '' }}"
+                                               href="{{ child.url }}"
+                                               {% if child.target %}target="{{ child.target }}"{% endif %}>
+                                                {{ child.title }}
+                                            </a>
+                                        </li>
+                                    {% endfor %}
+                                </ul>
+                            </li>
+                        {% else %}
+                            <li class="nav-item">
+                                <a class="nav-link{{ item.active ? ' active' : '' }}"
+                                   href="{{ item.url }}"
+                                   {% if item.active %}aria-current="page"{% endif %}
+                                   {% if item.target %}target="{{ item.target }}"{% endif %}>
+                                    {{ item.title }}
+                                </a>
+                            </li>
+                        {% endif %}
+                    {% endfor %}
+                </ul>
+
+                {% if dark_mode %}
+                    {% include 'partials/dark-mode-toggle.html.twig' %}
+                {% endif %}
+            </div>
+        </div>
+    </nav>
+</header>