Release Notes

Features

• theme="auto" follows the OS color scheme (prefers-color-scheme). Opt-in;
  default stays light. Closes #1186.
• transition={false} disables enter/exit animations, on the container or per
  toast. Closes #857.
• appendStyleSheet prop on <ToastContainer> appends the injected <style>
  tag to <head> instead of prepending it.

Fixes

• The injected stylesheet is prepended to <head> again, so CSS variable overrides
  work without !important (regression in 11.1.0). Thanks @Aakashpai, #1295.
  Closes #1287.

Internal

• Build migrated from tsup to tsdown. Publish layout unchanged.
• tsconfig: dropped deprecated baseUrl, scoped to library sources.
• CI: latest Node LTS, pnpm 12.
• Playground: type fixes, none transition option.

Thanks to @Aakashpai and reporters of the fixed issues.