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

admin/templates/pages/statistics.php

@@ -20,10 +20,20 @@ $periodLabels = [7 => 'Laatste 7 dagen', 30 => 'Laatste 30 dagen', 90 => 'Laatst
 
 <div class="d-flex justify-content-between align-items-center mb-4 flex-wrap gap-2">
     <h2 class="mb-0"><i class="bi bi-bar-chart"></i> Statistieken</h2>
-    <div class="btn-group">
-        <?php foreach ($periodLabels as $p => $label): ?>
-            <a href="/admin/statistics?period=<?= $p ?>" class="btn btn-sm <?= $period === $p ? 'btn-primary' : 'btn-outline-secondary' ?>"><?= htmlspecialchars($label) ?></a>
-        <?php endforeach; ?>
+    <div class="d-flex gap-2 flex-wrap">
+        <div class="btn-group">
+            <?php foreach ($periodLabels as $p => $label): ?>
+                <a href="/admin/statistics?period=<?= $p ?>" class="btn btn-sm <?= $period === $p ? 'btn-primary' : 'btn-outline-secondary' ?>"><?= htmlspecialchars($label) ?></a>
+            <?php endforeach; ?>
+        </div>
+        <div class="btn-group">
+            <a href="/admin/statistics?period=<?= $period ?>&export=csv" class="btn btn-sm btn-outline-success" title="Exporteer als CSV">
+                <i class="bi bi-filetype-csv"></i> CSV
+            </a>
+            <a href="/admin/statistics?period=<?= $period ?>&export=json" class="btn btn-sm btn-outline-success" title="Exporteer als JSON">
+                <i class="bi bi-filetype-json"></i> JSON
+            </a>
+        </div>
     </div>
 </div>