UI improved

config.example.php

@@ -18,3 +18,10 @@ define('COMPLETE_THRESHOLD', 0.95);
 
 // Allow new users to self-register from the login page.
 define('ALLOW_REGISTRATION', true);
+
+// Where generated course thumbnails are cached. Must be writable by the PHP
+// process; created automatically on first scan if missing.
+define('THUMBNAILS_DIR', __DIR__ . '/cache/thumbnails');
+
+// Capture each course's thumbnail this far into its first video (0.0-1.0).
+define('THUMBNAIL_SEEK_PERCENT', 0.4);