build: remove api: 'modern-compiler'

[skirtles-code]

The Vite setting css.preprocessorOptions.scss.api: 'modern-compiler' was added in #665, which was needed with Vite 5.

• In Vite 6, the default value of this setting was changed to 'modern-compiler'. Details
• In Vite 7, this setting was removed. Details

We're now using Vite 7, so it should be removed. Currently it causes a TS error when type checking the Vite config files.

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commit: 60fdacb