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/content-edit.php

@@ -45,7 +45,7 @@
             </div>
             <?php endif; ?>
             <div class="d-flex gap-2 mt-3">
-                <button type="submit" class="btn btn-primary">
+                <button type="submit" class="btn btn-primary" title="Opslaan (Ctrl+S)">
                     <i class="bi bi-check-lg"></i> Opslaan
                 </button>
                 <?php if ($isEditable): ?>

admin/templates/pages/content.php

@@ -57,6 +57,14 @@
 <?php endif; ?>
 
 <div class="card shadow-sm">
+    <div class="card-header bg-white py-2">
+        <div class="input-group input-group-sm">
+            <span class="input-group-text bg-white border-end-0"><i class="bi bi-search text-muted"></i></span>
+            <input type="search" id="contentFilter" class="form-control border-start-0"
+                   placeholder="Filter op bestands- of mapnaam&hellip;" autocomplete="off" aria-label="Filter content">
+            <span class="input-group-text bg-white text-muted" id="contentFilterCount"></span>
+        </div>
+    </div>
     <div class="table-responsive">
         <table class="table table-hover mb-0">
             <thead>
@@ -73,7 +81,7 @@
                     <tr><td colspan="5" class="text-muted text-center py-4">Geen bestanden gevonden.</td></tr>
                 <?php else: ?>
                     <?php foreach ($items as $item): ?>
-                        <tr>
+                        <tr data-name="<?= htmlspecialchars(mb_strtolower($item['name'])) ?>">
                             <td>
                                 <?php if ($item['is_dir']): ?>
                                     <a href="/admin/content?dir=<?= urlencode($item['path']) ?>">
@@ -134,11 +142,55 @@
                         </tr>
                     <?php endforeach; ?>
                 <?php endif; ?>
+                <tr id="contentFilterEmpty" class="d-none">
+                    <td colspan="5" class="text-muted text-center py-4">Geen resultaten voor deze filter.</td>
+                </tr>
             </tbody>
         </table>
     </div>
 </div>
 
+<script>
+(function () {
+    var input = document.getElementById('contentFilter');
+    var counter = document.getElementById('contentFilterCount');
+    var emptyRow = document.getElementById('contentFilterEmpty');
+    if (!input) return;
+
+    var rows = Array.prototype.slice.call(document.querySelectorAll('tbody tr[data-name]'));
+
+    function apply() {
+        var q = input.value.trim().toLowerCase();
+        var shown = 0;
+
+        rows.forEach(function (row) {
+            var match = q === '' || row.getAttribute('data-name').indexOf(q) !== -1;
+            row.classList.toggle('d-none', !match);
+            if (match) shown++;
+        });
+
+        if (emptyRow) {
+            emptyRow.classList.toggle('d-none', shown > 0 || rows.length === 0);
+        }
+        if (counter) {
+            counter.textContent = q === ''
+                ? rows.length + ' items'
+                : shown + ' van ' + rows.length;
+        }
+    }
+
+    input.addEventListener('input', apply);
+    input.addEventListener('keydown', function (e) {
+        if (e.key === 'Escape') {
+            input.value = '';
+            apply();
+        }
+    });
+
+    apply();
+})();
+</script>
+
 <!-- Create Directory Modal -->
 <div class="modal fade" id="createDirModal" tabindex="-1">
     <div class="modal-dialog">

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>