v2.5.1: Admin theme refactor, Navigation plugin, user roles, guide restructure

- Reorganize admin into admin/theme/default/ (views + assets)
- Rename GuideNav to Navigation plugin (essential, protected)
- Plugin assets support (SCSS/CSS) loaded after theme CSS
- User roles: Admin, Content Manager, BI Manager, Site Admin
- Role-based access control (RBAC) for admin routes and sidebar
- Guide restructure: sub-topics in separate folders with sidebar nav
- Dynamic breadcrumb for homepage and subdirectories
- Fix theme path traversal (../../ -> ../) in admin.php
- Fix CodeMirror mode load order (xml -> css -> js -> htmlmixed -> php)
- Fix editor-toolbar.js null checks for plugin edit pages
- Layout select from theme.json with live frontmatter update
- Footer sticky at bottom of viewport (min-height: 100vh)
- Breadcrumb color fix (var(--nav-font) -> var(--header-bg))
- Remove language switcher from guide pages
- Update README.md and README.en.md
- Bump version to 2.5.1

admin/theme/default/views/pages/statistics.twig

@@ -0,0 +1,80 @@
+{% extends "layouts/admin.twig" %}
+
+{% block title %}Statistieken - CodePress Admin{% endblock %}
+
+{% block content %}
+<h2 class="mb-4"><i class="bi bi-bar-chart"></i> Statistieken</h2>
+
+<div class="row g-4 mb-4">
+    <div class="col-md-4">
+        <div class="card stat-card shadow-sm">
+            <div class="card-body d-flex justify-content-between align-items-center">
+                <div>
+                    <h6 class="text-muted mb-1">Totaal aantal views</h6>
+                    <h3 class="mb-0">{{ (stats.totals.views ?? 0)|number_format(0, ',', '.') }}</h3>
+                </div>
+                <i class="bi bi-eye stat-icon text-primary"></i>
+            </div>
+        </div>
+    </div>
+    <div class="col-md-4">
+        <div class="card stat-card shadow-sm">
+            <div class="card-body d-flex justify-content-between align-items-center">
+                <div>
+                    <h6 class="text-muted mb-1">Unieke bezoekers</h6>
+                    <h3 class="mb-0">{{ (stats.totals.uniques ?? 0)|number_format(0, ',', '.') }}</h3>
+                </div>
+                <i class="bi bi-people stat-icon text-success"></i>
+            </div>
+        </div>
+    </div>
+    <div class="col-md-4">
+        <div class="card stat-card shadow-sm">
+            <div class="card-body d-flex justify-content-between align-items-center">
+                <div>
+                    <h6 class="text-muted mb-1">Pagina views</h6>
+                    <h3 class="mb-0">{{ (stats.pages|length ?? 0) }}</h3>
+                </div>
+                <i class="bi bi-file-earmark-text stat-icon text-info"></i>
+            </div>
+        </div>
+    </div>
+</div>
+
+<div class="row g-4">
+    <div class="col-md-6">
+        <div class="card shadow-sm">
+            <div class="card-header"><i class="bi bi-globe"></i> Landen</div>
+            <div class="card-body">
+                <table class="table table-sm mb-0">
+                    {% for country, count in stats.countries|slice(0, 10) %}
+                    <tr>
+                        <td>{{ get_country_flag(country) }} {{ get_country_name(country) }}</td>
+                        <td class="text-end">{{ count|number_format(0, ',', '.') }}</td>
+                    </tr>
+                    {% else %}
+                    <tr><td colspan="2" class="text-muted">Geen data</td></tr>
+                    {% endfor %}
+                </table>
+            </div>
+        </div>
+    </div>
+    <div class="col-md-6">
+        <div class="card shadow-sm">
+            <div class="card-header"><i class="bi bi-file-text"></i> Top pagina's</div>
+            <div class="card-body">
+                <table class="table table-sm mb-0">
+                    {% for page, count in stats.pages|slice(0, 10) %}
+                    <tr>
+                        <td><code class="text-muted">{{ page }}</code></td>
+                        <td class="text-end">{{ count|number_format(0, ',', '.') }}</td>
+                    </tr>
+                    {% else %}
+                    <tr><td colspan="2" class="text-muted">Geen data</td></tr>
+                    {% endfor %}
+                </table>
+            </div>
+        </div>
+    </div>
+</div>
+{% endblock %}