ver. 0.294: Code review complete — 96/96 classes, 27 fixes across all layers

Full codebase review of autoload/ directory (96 classes, ~1144 methods).
Fixes: null safety (query/find guards), redundant DI bypass, undefined
variables, missing globals, and Imagick WebP mime type bug in Helpers.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

autoload/Domain/Languages/LanguagesRepository.php

@@ -345,9 +345,10 @@ class LanguagesRepository
             return unserialize($objectData);
         }
 
-        $results = $this->db->query(
+        $stmt = $this->db->query(
             'SELECT id FROM pp_langs WHERE status = 1 ORDER BY start DESC, o ASC LIMIT 1'
-        )->fetchAll();
+        );
+        $results = $stmt ? $stmt->fetchAll() : [];
 
         $defaultLanguage = $results[0][0] ?? 'pl';