chore(deps): update dependency cssnano to v9

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
cssnano	8.0.10 → 9.0.2

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Release Notes

cssnano/cssnano (cssnano)

v9.0.2: v9.0.2

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What's Changed

• fix: add main and types to package manifests in #​1958
• fix: update postcss-calc

Full Changelog: https://github.com/cssnano/cssnano/compare/cssnano@9.0.1...cssnano@9.0.2

v9.0.1: v9.0.1

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What's Changed

• refactor: some small performance gains in #​1955

Full Changelog: https://github.com/cssnano/cssnano/compare/cssnano@9.0.0...cssnano@9.0.1

v9.0.0: v9.0.0

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What's Changed

Breaking changes

• Migrate to ESM and simplify config loading in #​1948

Probably backward-compatible for most users. Some changes to configuration loading documented in migration guide.

Bug fixes

• Introduce new postcss-calc plugin in 34aec91

Full Changelog: https://github.com/cssnano/cssnano/compare/cssnano@8.0.10...cssnano@9.0.0

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[doistbot]

This PR is a routine Renovate bump of cssnano from 8.0.10 to 9.0.2, touching only package.json and package-lock.json. The lockfile changes look consistent — the new cssnano preset's postcss peer range is satisfied by the installed postcss, and the new Node engines ranges match the repo's engines, .node-version, and CI matrix.

Few things worth tightening:

• cssnano 9 is ESM-only (the release notes list the ESM migration as a breaking change), but postcss.config.js still uses require('cssnano') and the package has no "type": "module". Node will throw ERR_REQUIRE_ESM when Vite/Storybook load the config.
• Consider renaming to postcss.config.mjs with an ESM import, or keeping CommonJS and loading cssnano via await import('cssnano') in an async config.

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[doistbot]

cssnano 9 is ESM-only (the release notes list "Migrate to ESM" as a breaking change), but postcss.config.js still loads it with require('cssnano'). This repo has no "type": "module", so that config resolves as CommonJS, and Node throws ERR_REQUIRE_ESM when Vite/Storybook load it. Convert the config to ESM (e.g. postcss.config.mjs with import cssnano from 'cssnano') or keep it CommonJS and load the plugin via await import('cssnano') in an async config.