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

version.php

@@ -6,12 +6,28 @@
  */
 
 return [
-    'version' => '1.9.0',
+    'version' => '1.9.1',
     'release_date' => '2026-07-29',
     'codename' => 'Atlas',
     'status' => 'stable',
 
     'changelog' => [
+        '1.9.1' => [
+            'date' => '2026-07-29',
+            'changes' => [
+                'Fix world map: zero-padded ISO numeric ids left 31 countries unrendered (Brazil, Australia, Belgium, Austria, Algeria and more)',
+                'Fix world map: Russia and Fiji smeared across the full map width at the antimeridian; rings are now unwrapped and drawn at both edges',
+                'World map cropped to 84N-60S with evenodd fill rule, 174 countries',
+                'Logger::tail() reads the log backwards in chunks instead of loading the whole file',
+                'External links get rel="noopener noreferrer" in the footer and in Markdown content',
+                'formatDisplayName() cleaned up and guarded against empty input',
+                'Export statistics as CSV (Excel-compatible BOM) or JSON',
+                'GeoIP database auto-updates when older than 35 days',
+                'Editor shortcuts: Ctrl/Cmd+S to save, Ctrl/Cmd+N for a new page',
+                'Live search filter in the admin content browser',
+                'Content versioning: timestamped .bak copies in content/-backups/, 5 versions per file',
+            ]
+        ],
         '1.9.0' => [
             'date' => '2026-07-29',
             'changes' => [