Fix unreachable index page and duplicate homepage entry in navigation

buildUrl() hardcoded 'index' as the homepage, so the menu link for
index.md pointed at /nl. With a different default_page that root URL
served another page, making index.md unreachable.

- Add getEffectiveDefaultPage(): resolves 'auto' to the detected page
  and caches the result
- buildUrl() now omits the page segment only for the effective default
  page instead of the literal string 'index'
- Route getPage(), generateBreadcrumb(), getContentType() and the
  render() template data (default_page, homepage, is_homepage,
  home_active_class, current_page, lang switch URLs) through it
- getHomepageTitle() returns t('home') so the home button no longer
  duplicates a menu item label
- Drop the now-redundant default_page skip in renderMenu() so every
  page stays reachable from the menu
- getAllContentDirs() also skips dot-directories (.git) in the move
  dropdown

cms/core/class/CodePressCMS.php

@@ -25,6 +25,7 @@ class CodePressCMS {
     public $currentLanguage;
     public $searchResults = [];
     private $menu = [];
+    private ?string $effectiveDefaultPage = null;
     private $translations = [];
     private $pluginManager;
     
@@ -66,10 +67,12 @@ class CodePressCMS {
      * @param array $params Additional query parameters
      * @return string Clean URL
      */
-    public function buildUrl($page = 'index', $lang = null, $params = []) {
+    public function buildUrl($page = null, $lang = null, $params = []) {
         $lang = $lang ?: $this->currentLanguage;
         $url = '/' . $lang;
-        if ($page && $page !== 'index') {
+        // Only omit the page segment for the actual homepage (default_page),
+        // not for a page that happens to be called 'index'
+        if ($page && $page !== $this->getEffectiveDefaultPage()) {
             $url .= '/' . $page;
         }
         if (!empty($params)) {
@@ -78,6 +81,20 @@ class CodePressCMS {
         return $url;
     }
 
+    /**
+     * Resolve the effective default page (handles 'auto' mode)
+     *
+     * @return string Page key that is served on the language root URL
+     */
+    public function getEffectiveDefaultPage(): string
+    {
+        if ($this->effectiveDefaultPage === null) {
+            $page = $this->config['default_page'] ?? 'auto';
+            $this->effectiveDefaultPage = ($page === 'auto') ? $this->detectDefaultPage() : $page;
+        }
+        return $this->effectiveDefaultPage;
+    }
+
     /**
      * Build a clean admin URL
      * 
@@ -353,10 +370,7 @@ class CodePressCMS {
             return $this->getGuidePage();
         }
         
-        $page = $_GET['page'] ?? $this->config['default_page'];
-        if ($page === 'auto') {
-            $page = $this->detectDefaultPage();
-        }
+        $page = $_GET['page'] ?? $this->getEffectiveDefaultPage();
         // Limit length
         $page = substr($page, 0, 255);
         // Only remove file extension at the end, not all dots
@@ -1057,11 +1071,11 @@ class CodePressCMS {
             'search_query' => isset($_GET['search']) ? htmlspecialchars($_GET['search']) : '',
             'menu' => $this->renderMenu($menu),
             'breadcrumb' => $breadcrumb,
-            'default_page' => $this->config['default_page'],
-            'homepage' => $this->config['default_page'],
+            'default_page' => $this->getEffectiveDefaultPage(),
+            'homepage' => $this->getEffectiveDefaultPage(),
             'homepage_title' => $homepageTitle,
-            'is_homepage' => (!isset($_GET['page']) || $_GET['page'] === $this->config['default_page']),
-            'home_active_class' => (!isset($_GET['page']) || $_GET['page'] === $this->config['default_page']) ? 'active' : '',
+            'is_homepage' => (!isset($_GET['page']) || $_GET['page'] === $this->getEffectiveDefaultPage()),
+            'home_active_class' => (!isset($_GET['page']) || $_GET['page'] === $this->getEffectiveDefaultPage()) ? 'active' : '',
             'is_guide_page' => isset($_GET['guide']),
             'lang_switch_url' => '',
             'author_name' => $this->config['author']['name'] ?? 'CodePress Developer',
@@ -1084,11 +1098,11 @@ class CodePressCMS {
             // Language
             'current_lang' => $this->currentLanguage,
             'current_lang_upper' => strtoupper($this->currentLanguage),
-            'current_page' => $_GET['page'] ?? $this->config['default_page'],
+            'current_page' => $_GET['page'] ?? $this->getEffectiveDefaultPage(),
             'available_langs' => array_map(function($lang) {
                 $lang['is_current'] = $lang['code'] === $this->currentLanguage;
-                $page = $_GET['page'] ?? $this->config['default_page'];
-                $lang['url'] = '/' . $lang['code'] . ($page !== $this->config['default_page'] ? '/' . $page : '');
+                $page = $_GET['page'] ?? $this->getEffectiveDefaultPage();
+                $lang['url'] = '/' . $lang['code'] . ($page !== $this->getEffectiveDefaultPage() ? '/' . $page : '');
                 return $lang;
             }, $this->getAvailableLanguages()),
             // Translations
@@ -1187,12 +1201,12 @@ class CodePressCMS {
             return '<nav aria-label="breadcrumb"><ol class="breadcrumb">' . $sidebarToggle . '<li class="breadcrumb-item"><a href="/' . $this->currentLanguage . '"><i class="bi bi-house"></i></a></li><li class="breadcrumb-item"> > </li><li class="breadcrumb-item active">' . $this->t('search') . '</li></ol></nav>';
         }
         
-        $page = $_GET['page'] ?? $this->config['default_page'];
+        $page = $_GET['page'] ?? $this->getEffectiveDefaultPage();
         $page = htmlspecialchars($page, ENT_QUOTES, 'UTF-8');
         $page = preg_replace('/\.[^.]+$/', '', $page);
         
         // Convert page to clean URL format for breadcrumb
-        if ($page === $this->config['default_page']) {
+        if ($page === $this->getEffectiveDefaultPage()) {
             return '<nav aria-label="breadcrumb"><ol class="breadcrumb">' . $sidebarToggle . '<li class="breadcrumb-item active"><i class="bi bi-house"></i></li></ol></nav>';
         }
         
@@ -1274,11 +1288,6 @@ class CodePressCMS {
             } else {
                 // Show files in root as tabs, files in folders as dropdown items
                 if ($level === 0) {
-                    // Don't show the homepage file as a separate tab since it's already the Home button
-                    if ($item['path'] === $this->config['default_page']) {
-                        continue;
-                    }
-                    
                     $active = (isset($_GET['page']) && $_GET['page'] === $item['path']) ? 'active' : '';
                     $html .= '<li class="nav-item">';
                     $html .= '<a class="nav-link ' . $active . '" href="' . htmlspecialchars($item['url']) . '">';
@@ -1305,7 +1314,7 @@ class CodePressCMS {
      */
     private function getContentType($page) {
         // Try to determine content type from page request
-        $pagePath = $_GET['page'] ?? $this->config['default_page'];
+        $pagePath = $_GET['page'] ?? $this->getEffectiveDefaultPage();
         $pagePath = preg_replace('/\.[^.]+$/', '', $pagePath);
         
         $filePath = $this->config['content_dir'] . '/' . $pagePath;
@@ -1363,12 +1372,9 @@ class CodePressCMS {
      * @return string Homepage title
      */
     private function getHomepageTitle() {
-        // Use formatted filename for homepage title in navigation
-        $page = $this->config['default_page'];
-        if ($page === 'auto') {
-            $page = $this->detectDefaultPage();
-        }
-        return $this->formatDisplayName($page);
+        // Use a generic "Home" label instead of the page name
+        // to avoid duplication with the navigation menu
+        return $this->t('home');
     }
     
     /**