v1.9.1: fix world map rendering and resolve eight small TODO items

World map:
- Fix zero-padded ISO numeric ids leaving 31 countries unrendered
  (Brazil, Australia, Belgium, Austria, Algeria and more)
- Fix Russia and Fiji smearing across the full map width at the antimeridian
  by unwrapping ring longitudes and drawing them at both edges
- Crop to 84N-60S, add evenodd fill rule, 174 countries rendered

Improvements:
- Logger::tail() reads backwards in chunks instead of loading the whole file
- External links get rel=noopener noreferrer in footer and Markdown content
- formatDisplayName() cleaned up and guarded against empty input
- Export statistics as CSV (Excel BOM) or JSON
- GeoIP database auto-updates when older than 35 days
- Editor shortcuts Ctrl/Cmd+S to save and Ctrl/Cmd+N for a new page
- Live search filter in the admin content browser
- Content versioning with timestamped .bak copies in content/-backups/

Also removes eight stale TODO entries that were already implemented

cms/core/class/CodePressCMS.php

@@ -573,6 +573,35 @@ class CodePressCMS {
         ];
     }
     
+    /**
+     * Get hosts that count as internal for external-link detection
+     *
+     * @return array List of host names
+     */
+    private function getInternalHosts(): array
+    {
+        $hosts = [];
+
+        if (!empty($_SERVER['HTTP_HOST'])) {
+            $host = strtolower(preg_replace('/:\d+$/', '', $_SERVER['HTTP_HOST']));
+            if ($host !== '') {
+                $hosts[] = $host;
+                // Treat www and apex variants as the same site
+                $hosts[] = str_starts_with($host, 'www.') ? substr($host, 4) : 'www.' . $host;
+            }
+        }
+
+        $authorWebsite = $this->config['author']['website'] ?? '';
+        if ($authorWebsite !== '') {
+            $authorHost = parse_url($authorWebsite, PHP_URL_HOST);
+            if ($authorHost) {
+                $hosts[] = strtolower($authorHost);
+            }
+        }
+
+        return array_values(array_unique(array_filter($hosts)));
+    }
+
     /**
      * Parse Markdown content to HTML using League CommonMark
      * 
@@ -607,6 +636,14 @@ class CodePressCMS {
                 'symbol' => '',
                 'aria_hidden' => true,
             ],
+            'external_link' => [
+                'internal_hosts' => $this->getInternalHosts(),
+                'open_in_new_window' => true,
+                'html_class' => 'external-link',
+                'nofollow' => '',
+                'noopener' => 'external',
+                'noreferrer' => 'external',
+            ],
         ];
         
         // Create environment with extensions
@@ -617,6 +654,7 @@ class CodePressCMS {
         $environment->addExtension(new \League\CommonMark\Extension\Table\TableExtension());
         $environment->addExtension(new \League\CommonMark\Extension\TaskList\TaskListExtension());
         $environment->addExtension(new \League\CommonMark\Extension\HeadingPermalink\HeadingPermalinkExtension());
+        $environment->addExtension(new \League\CommonMark\Extension\ExternalLink\ExternalLinkExtension());
         
         // Handle custom image size syntax: ![alt](url){:width="300" height="200"}
         $imagePlaceholders = [];
@@ -755,30 +793,33 @@ class CodePressCMS {
      * @return string Formatted display name
      */
     private function formatDisplayName($filename) {
+        $filename = (string)$filename;
+        if ($filename === '') {
+            return '';
+        }
+
         $hasLeadingDash = $filename[0] === '-';
         if ($hasLeadingDash) {
             $filename = substr($filename, 1);
         }
         
         $availableLangs = array_keys($this->getAvailableLanguages());
-        $langPattern = '/^(' . implode('|', $availableLangs) . ')\.(.+)$/';
-        if (preg_match($langPattern, $filename, $matches)) {
-            $filename = $matches[2];
+        if (!empty($availableLangs)) {
+            $langPattern = '/^(' . implode('|', array_map('preg_quote', $availableLangs)) . ')\.(.+)$/';
+            if (preg_match($langPattern, $filename, $matches)) {
+                $filename = $matches[2];
+            }
         }
         
         $filename = preg_replace('/\.(md|php|html)$/', '', $filename);
         
-        $name = str_replace(['-', '_'], ' ', $filename);
-        $name = trim($name);
+        $name = trim(str_replace(['-', '_'], ' ', $filename));
         $name = ucwords(strtolower($name));
         
         $specialCases = ['phpinfo' => 'phpinfo', 'ict' => 'ICT'];
         $lower = strtolower($name);
-        if (isset($specialCases[$lower])) {
-            $name = $specialCases[$lower];
-        } else {
-            $name = str_ireplace(array_keys($specialCases), array_values($specialCases), $name);
-        }
+        $name = $specialCases[$lower]
+            ?? str_ireplace(array_keys($specialCases), array_values($specialCases), $name);
         
         return ($hasLeadingDash ? '- ' : '') . $name;
     }