Update to pnpm v11.7.0

[VictoriaBeilsten-Edmands]

• Updates pnpm to v11.7.0 via codemod. This removes .npmrc and moves some settings into pnpm-workspace.yaml
• Adds explicit jsdom dependency
• Splits TS config to separate concerns:
  • tsconfig.rollup.json for rollup transpilation
  • tsconfig.build.json for declaration-only input
• Updates rollup to use tsconfig.rollup.json and adds outDir for compatibility with newer @rollup/plugin-typescript version
• Updates build script to explicitly run decalration build (tsc -p tsconfig.build.json)
• Updates jest-dom import to usevitest entrypoint
• Removes @testing-library/jest-dom from tsconfig types field
• Tweaks tests relying on CSS parsing to match jsdom behaviour

Closes #223