storybook 8.5.0-alpha.20 on Node.js NPM

8.5.0-alpha.20

Addon Test: Add @vitest/coverage-v8 during postinstall if no coverage reporter is installed - #29993, thanks @ghengeveld!
Addon Test: Add support for previewHead - #29808, thanks @ndelangen!
Addon Test: Always run Vitest in watch mode internally - #29749, thanks @JReinhold!
Addon Test: Filter out falsy test results in TestProviderRender - #30001, thanks @valentinpalkovic!
Addon Test: Handle undefined storyId - #29998, thanks @ghengeveld!
Addon Test: Make component tests status row link to the story's tests panel - #29992, thanks @ghengeveld!
Addon Test: Merge viteFinal config into vitest config - #29806, thanks @ndelangen!
Addon Test: Prompt switch to experimental-nextjs-vite - #29814, thanks @ndelangen!
Addon Test: Use ProgressSpinner for stop button in Testing Module - #29997, thanks @ghengeveld!