⚡️ First-class Vitest integration to run stories as component tests
🔼 Next.js-Vite framework for Vitest compatibility and better DX
🗜️ Further reduced bundle size for a smaller install footprint
🌐 Experimental Story globals to standardize stories for themes, viewports, and locales
💯 Hundreds more improvements

<details> <summary>List of all updates</summary>

Addon Test: Improve messages and post install script handling - #29036, thanks @yannbf!
Addon Viewport: Add default options via parameters - #28944, thanks @ndelangen!
Addon Test: Add experimental vitest integration - #28768, thanks @kasperpeulen!
Addon Test: Fix error message logic in set up file - #28906, thanks @yannbf!
Addon Test: Fix indentation of 'vitePluginNext' in generated Vitest config file - #29011, thanks @ghengeveld!
Addon Test: Fix postinstall file types - #28978, thanks @shilman!
Addon Test: Fix tests potentially not existing in non-isolate mode - #28993, thanks @yannbf!
Addon Test: Improve transformation logic to avoid duplicate tests - #28929, thanks @yannbf!
Addon Test: Set default viewport if applicable - #28905, thanks @yannbf!
Addon Test: Set screenshotFailures to false by default - #28908, thanks @yannbf!
Addon Docs: Remove babel dependency - #28915, thanks @shilman!
Addon Interactions: Fix status in panel tab - #28580, thanks @yannbf!
Angular: Fix Angular template error for props with a circular reference - #28498, thanks @Marklb!
Angular: Fix template props not able to use dot notation - #28588, thanks @Marklb!
Backgrounds/Viewports: Make defaults overridable in StoryGlobals-mode - #29025, thanks @JReinhold!
Blocks: Fix scroll to non-ascii anchors - #28826, thanks @SkReD!
Build: Remove external overrides, use package.json as source of truth - #28632, thanks @kasperpeulen!
Builder-Vite: Add null character prefix to virtual file IDs - #28863, thanks @valentinpalkovic!
Builder-Vite: Fix 'condition node never be used' warning - #28989, thanks @valentinpalkovic!
CLI: Add conditional logging for manager and preview start - #28603, thanks @tobiasdiez!
CLI: Fix dedent import in package managers - #28980, thanks @shilman!
CLI: Fix the initialization of Storybook in workspaces - #28699, thanks @valentinpalkovic!
CLI: Handle Yarn PnP wrapper scenario when adding an addon - #29027, thanks @yannbf!
CLI: Make PackageJson optional for starting a dev server - #28594, thanks @tobiasdiez!
CLI: Update spawn options in proxy.ts to support Windows - #28990, thanks @valentinpalkovic!
Components: Remove external overrides - #28632, thanks @kasperpeulen!
ConfigFile: Fix as const satisfies modifiers - #29000, thanks @shilman!
Controls: Add disableSave parameter - #28734, thanks @valentinpalkovic!
Core: Add Rsbuild frameworks to known frameworks - #28694, thanks @fi3ework!
Core: De-duplicate babel use in core - #28972, thanks @ndelangen!
Core: Fix header for MountMustBeDestructuredError message - #28590, thanks @0916dhkim!
Core: Fix manager-builder tsconfig to emit react-jsx - #28541, thanks @williamhelmrath!
Core: Introduce setProjectAnnotations API to more renderers and frameworks - #28907, thanks @yannbf!
Core: Make sure CJS build always has lowest prio - #28829, thanks @kasperpeulen!
Core: Move util to regular dependency - #29008, thanks @ndelangen!
Core: Split Storybook CLI - #28519, thanks @kasperpeulen!
Core: Upgrade docs-mdx for smaller install - #28552, thanks @shilman!
CPC: Add ESM export to docs-tools & node-logger packages - #28539, thanks @ndelangen!
CPC: Fix missing dependency in @storybook/addon-interactions - #28518, thanks @ndelangen!
CPC: Fix type generation - #28507, thanks @ndelangen!
CPC: Revert renames of panels, addon_ids - #28524, thanks @ndelangen!
CSF: Allow overridding globals at the story level - #26654, thanks @tmeasday!
Dependencies: Upgrade commander - #28857, thanks @43081j!
Fix: Add header for MountMustBeDestructuredError message - #28590, thanks @0916dhkim!
Fix: Prevent iframe from capturing mouse events in composed Storybooks - #28568, thanks @Vincentdevreede!
Maintenance: Add node:-prefix to node core-modules - #28860, thanks @ndelangen!
Maintenance: Rename addon-vitest to addon-test - #29014, thanks @yannbf!
Next.js-Vite: Fix vite plugin exports - #29046, thanks @valentinpalkovic!
Next.js-Vite: Streamline Next.js dir option - #28995, thanks @valentinpalkovic!
Next.js-Vite: Update next and vite-plugin-storybook-nextjs dependencies - #28994, thanks @valentinpalkovic!
Next.js: Add @storybook/nextjs-vite package - #28800, thanks @valentinpalkovic!
Next.js: Fix wrong Next.js framework reference - #28992, thanks @valentinpalkovic!
Next.js: Make RSC portable-stories compatible - #28756, thanks @valentinpalkovic!
Next.js: Update dependencies - #29052, thanks @valentinpalkovic!
Nextjs-Vite: Re-export vite-plugin-storybook-nextjs - #29012, thanks @valentinpalkovic!
Portable Stories: Improve Handling of React Updates and Errors - #29044, thanks @valentinpalkovic!
React: Avoid 'Dynamic require of react is not possible' issue - #28730, thanks @valentinpalkovic!
React: Bundle in lodash - #28609, thanks @ndelangen!
Svelte: Fix events not being logged in Actions when a story has decorators - #28247, thanks @JReinhold!
SvelteKit: Introduce portable stories support - #28918, thanks @yannbf!
SvelteKit/Vue3: Refactor plugin export paths - #29016, thanks @yannbf!
Telemetry: Add globals stats - #28822, thanks @shilman!
Telemetry: Add portable stories - #26764, thanks @shilman!
Test: Fix support for TS < 4.7 - #28887, thanks @ndelangen!
Test: Rename vitest plugin entrypoint - #29067, thanks @yannbf!
Test: Upgrade Vitest to v2 - #28788, thanks @yannbf!
Types: Adjust beforeAll to be non-nullable in NormalizedProjectAnnotations - #28671, thanks @kasperpeulen!
Types: Update type signatures of objects and functions - #28503, thanks @valentinpalkovic!
UI: Fix collapse/expand all functionality - #28582, thanks @filipemelo2002!
UI: Fix conditional hooks usage in sidebar - #28979, thanks @JReinhold!
UI: Fix sidebar not wrapping - #29055, thanks @JReinhold!
Vite: Fix HMR - #28876, thanks @ndelangen!
Vite: Fix missing source map warning - #28984, thanks @valentinpalkovic!
Vitest: Fix add command - #28975, thanks @ghengeveld!
Vitest: Fix default viewport - #28943, thanks @kasperpeulen!
Vitest: Implement add command for vitest addon - #28920, thanks @kasperpeulen!
Vue: Add missing prop controls when using vue-component-meta docgen plugin - #28760, thanks @larsrickert!
Vue: Improve generated code snippets - #27194, thanks @larsrickert!
Vue3: Add vite plugin for portable stories - #29004, thanks @yannbf!

</details>