feat: update temp PNG file glob pattern in ImageTest to match all transcoded images

Author: developersharif

tests/widgets_test/ImageTest.php

@@ -51,12 +51,12 @@
 
     // The transcoded temp PNG should exist on disk while the widget lives,
     // and disappear when destroy() is called.
-    $tempsBefore = glob(sys_get_temp_dir() . '/phpgui_img_*.png') ?: [];
+    $tempsBefore = glob(sys_get_temp_dir() . '/phpgui_img_*') ?: [];
     TestRunner::assert(count($tempsBefore) >= 1, 'GD transcode produced a temp PNG on disk');
 
     $jpgImage->destroy();
     TestRunner::assertWidgetGone($jpgPathOut, 'JPG image label gone after destroy()');
-    $tempsAfter = glob(sys_get_temp_dir() . '/phpgui_img_*.png') ?: [];
+    $tempsAfter = glob(sys_get_temp_dir() . '/phpgui_img_*') ?: [];
     TestRunner::assert(count($tempsAfter) < count($tempsBefore), 'destroy() unlinks the transcoded temp PNG');
 }