Histoire is unmaintained and blocks upgrading Vite and other dev
dependencies. Replace it with a small standalone Vite app that keeps the
same `<Story>`/`<Variant>` template API so story files need no changes.
- Add vite.stories.config.ts and app/javascript/stories/ (sidebar tree
with collapsible groups, search, dark-mode and RTL/LTR toggles, and a
per-story error boundary)
- Globally register Story/Variant; migrate the histoire setup (store,
i18n, plugins/directives) and seed a memory router for route-aware
components
- Repoint story:dev/build/preview scripts and drop the histoire deps
- Remove histoire.config.ts, histoire.setup.ts and histoire.scss
Shivam Mishra
4ede0f58d2