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
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# Twig templates
## Basis syntax
```twig
{# Commentaar #}
{{ variabele }}
{{ variabele|default('standaard') }}
{% if voorwaarde %}...{% endif %}
{% for item in items %}...{% endfor %}
{% extends 'base.twig' %}
{% block content %}{% endblock %}
{% include 'partials/header.twig' %}
```
## base.twig voorbeeld
```twig
<!DOCTYPE html>
<html lang="{{ current_lang }}">
<head>
<meta charset="UTF-8">
<title>{{ page_title }} - {{ site_title }}</title>
<meta name="description" content="{{ seo_description }}">
<link rel="stylesheet" href="{{ theme_css_url }}">
</head>
<body>
{% include 'partials/header.twig' %}
{% block content %}{% endblock %}
{% include 'partials/footer.twig' %}
</body>
</html>
```
## Variabelen beschikbaar in templates
### Pagina data
| Variabele | Type | Beschrijving |
|-----------|------|--------------|
| `page_title` | string | Titel van huidige pagina (HTML-escaped) |
| `content` | string | Ge-renderde pagina content (HTML) |
| `page_metadata` | array | Frontmatter metadata van de pagina |
| `layout` | string | Layout naam (bijv. `full_content`) |
| `sidebar_content` | string | Sidebar content van plugins (HTML) |
| `breadcrumb` | string | Breadcrumb HTML (gegeneerd door CMS) |
### Site data
| Variabele | Type | Beschrijving |
|-----------|------|--------------|
| `site_title` | string | Site titel uit config.json |
| `default_page` | string | Standaard pagina pad |
| `homepage` | string | Homepage pad |
| `homepage_title` | string | Homepage titel |
| `is_homepage` | bool | Of huidige pagina de homepage is |
| `is_guide_page` | bool | Of huidige pagina een handleiding is |
| `has_content` | bool | Of content map niet leeg is |
| `cms_version` | string | CMS versie nummer |
### Menu & Navigatie
| Variabele | Type | Beschrijving |
|-----------|------|--------------|
| `menu` | string | Ge-renderd menu HTML |
| `current_page` | string | Huidige pagina pad |
| `breadcrumb` | string | Breadcrumb HTML |
### Taal
| Variabele | Type | Beschrijving |
|-----------|------|--------------|
| `current_lang` | string | Huidige taal code (bijv. `nl`) |
| `current_lang_upper` | string | Huidige taal in hoofdletters |
| `available_langs` | array | Beschikbare talen met `code`, `name`, `url`, `is_current` |
### SEO
| Variabele | Type | Beschrijving |
|-----------|------|--------------|
| `seo_description` | string | SEO beschrijving |
| `seo_keywords` | string | SEO keywords |
| `block_ai_bots` | bool | AI bots blokkeren |
| `block_search_engines` | bool | Zoekmachines blokkeren |
### Auteur
| Variabele | Type | Beschrijving |
|-----------|------|--------------|
| `author_name` | string | Auteur naam |
| `author_website` | string | Auteur website URL |
| `author_git` | string | Auteur Git URL |
### Theme
| Variabele | Type | Beschrijving |
|-----------|------|--------------|
| `theme_title` | string | Thema titel |
| `theme_css_url` | string | Gecompileerde CSS URL |
| `theme_js_url` | string | JavaScript URL |
| `theme_config` | array | Thema configuratie uit theme.json |
| `theme_base_url` | string | Basis URL van thema (bijv. `/themes/default`) |
| `theme_css_files` | array | Lijst van CSS bestanden |
| `theme_js_files` | array | Lijst van JS bestanden |
| `theme_favicon` | string | Favicon URL |
| `plugin_css_urls` | array | CSS URLs van plugins (geladen ná theme CSS) |
### Theme kleuren
| Variabele | Type | Beschrijving |
|-----------|------|--------------|
| `header_color` | string | Header achtergrondkleur |
| `header_font_color` | string | Header tekstkleur |
| `header_height` | string | Header hoogte in px |
| `navigation_color` | string | Navigatie achtergrondkleur |
| `navigation_font_color` | string | Navigatie tekstkleur |
| `nav_height` | string | Navigatie hoogte in px |
| `sidebar_background` | string | Sidebar achtergrondkleur |
| `sidebar_border` | string | Sidebar randkleur |
### Bestandsinfo
| Variabele | Type | Beschrijving |
|-----------|------|--------------|
| `created` | string | Aanmaakdatum van bestand |
| `modified` | string | Wijzigingsdatum van bestand |
| `show_created` | bool | Of aanmaakdatum getoond moet worden |
| `file_info_block` | bool | Of bestandsinfo blok getoond moet worden |
### Vertalingen
| Variabele | Type | Beschrijving |
|-----------|------|--------------|
| `t_home` | string | "Home" vertaling |
| `t_search` | string | "Zoeken" vertaling |
| `t_search_placeholder` | string | Zoekbalk placeholder vertaling |
| `t_search_button` | string | Zoekknop vertaling |
| `t_welcome` | string | "Welkom" vertaling |
| `t_created` | string | "Aangemaakt" vertaling |
| `t_modified` | string | "Gewijzigd" vertaling |
| `t_author` | string | "Auteur" vertaling |
| `t_manual` | string | "Handleiding" vertaling |
| `t_guide` | string | "Handleiding" vertaling |
| `t_no_content` | string | "Geen content" vertaling |
| `t_no_results` | string | "Geen resultaten" vertaling |
| `t_results_found` | string | "Resultaten gevonden" vertaling |
| `t_powered_by` | string | "Aangedreven door" vertaling |
| `t_page_not_found` | string | "Pagina niet gevonden" vertaling |
| `t_page_not_found_text` | string | "Pagina niet gevonden" tekst vertaling |
| `t_mappen` | string | "Mappen" vertaling |
| `t_paginas` | string | "Pagina's" vertaling |
## Layouts en blocks
Een layout template extends `base.twig` en vult het `content` block:
```twig
{% extends 'base.twig' %}
{% block content %}
<div class="container">
{{ content|raw }}
</div>
{% endblock %}
```
## Conditionele sidebar
```twig
{% if sidebar_content %}
<div class="row">
<aside class="col-md-4">
{{ sidebar_content|raw }}
</aside>
<main class="col-md-8">
{{ content|raw }}
</main>
</div>
{% else %}
<div class="container">
{{ content|raw }}
</div>
{% endif %}
```
## Taal switcher
```twig
{% for lang in available_langs %}
<a href="{{ lang.url }}" class="{{ lang.is_current ? 'active' : '' }}">
{{ lang.name }}
</a>
{% endfor %}
```
## Plugin CSS laden
Plugin CSS wordt automatisch geladen ná theme CSS, zodat themes plugin styling kunnen overschrijven:
```twig
{% for cssUrl in plugin_css_urls|default([]) %}
<link href="{{ cssUrl }}" rel="stylesheet">
{% endfor %}
```