Migrate from Sass variables to `<DesignTokens/>`

[awesomephant]

• Card
• ChartFooter
• ChartHeader
• Switcher
• Autocomplete deprecated, replaced by Select?
• Select

[awesomephant]

• [Feature Request] Make test-runner work with Svelte CSF. storybookjs/test-runner#262 (comment)
  • Resolved by migrating from test-runner to vitest