PenguinMod-Port/scratch-blocks — reverse-engineered prompt

Build me a PenguinMod version of the Scratch blocks editor, focused on the built in blocks and the newer TurboWarp style updates. I want it to feel like the Scratch block workspace where people can drag colorful blocks, snap them together vertically, test the blocks in a browser playground, and use it as the blocks package for a Scratch like editor.

Please set it up so I can run it locally, open the vertical playground in the browser, make changes to blocks, and rebuild the compressed files when needed. Keep the project organized like a real reusable JavaScript library, with the block definitions, shared code, media, messages, translations, tests, and build scripts in the right places.

Don’t build a whole coding website around it unless needed. The main goal is a working blocks library and preview page for PenguinMod. If anything is unclear, follow the current Scratch Blocks, PenguinMod, and TurboWarp behavior, and look up current docs online if you need to.