Literal `\n` are interpreted as newlines in %X% html substitution with vite-envs.sh

[garronej]

It's not a big deal realy and it's hard to fix because ...shell.

Reference: https://chat.openai.com/share/24f920e5-58b9-4c80-8d78-b5ba9c17c402

For window.__VITE_ENVS everything works flawlessly. It's only for the %% substitution in the html that there can be minor inconsistencies.