fix: View::e() accept mixed type to handle int/null IDs from APIs

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

core/View.php

@@ -81,12 +81,12 @@ class View
         return MODULES_PATH . "/{$view}.php";
     }
 
-    public static function escape(?string $value): string
+    public static function escape(mixed $value): string
     {
-        return htmlspecialchars($value ?? '', ENT_QUOTES, 'UTF-8');
+        return htmlspecialchars((string)($value ?? ''), ENT_QUOTES, 'UTF-8');
     }
 
-    public static function e(?string $value): string
+    public static function e(mixed $value): string
     {
         return self::escape($value);
     }