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Jake Howell ea8ba0c678 refactor: remove MUI and Emotion (#27821)
> 🤖 This PR was modified by Coder Agents on behalf of Jake Howell.

Until we meet again.

## Stack

- #27636
- #27718 
- #27719 
- #27722
- #27723
- #27724
- #27728
- #27730
- #27732
- #27762
- #27763
- #27786
- #27787
- #27788
- #27789
- #27790
- #27791 
- #27817 
- #27820
- #28009

## Final removal (`c39b664`)

Removes the last of MUI and Emotion now that every surface has been
migrated:

- **Dependencies**: drops `@mui/material` and
`@emotion/{cache,css,react,styled}` from `package.json` /
`pnpm-lock.yaml`, and deletes the `@types/emotion.d.ts` and
`@types/mui.d.ts` module augmentations.
- **Theming**: replaces the Emotion `CacheProvider`, MUI `ThemeProvider`
/ `StyledEngineProvider`, and `CssBaseline` in `ThemeProvider` with a
lightweight `theme/context.tsx` that exposes `ThemeContextProvider` and
a `useTheme` hook.
- **Global styles**: moves the base `body` styles (background, text
color, font, antialiasing) that `CssBaseline` previously provided into
`index.css`, and drops the temporary MUI modal/popover scrollbar-gutter
workaround.
- **Cleanup**: removes the MUI → shadcn / Emotion → Tailwind migration
guidance from `site/AGENTS.md`, updates the Storybook `preview.tsx`, and
adjusts assorted components (`Command`, `Slider`, `Switch`, `Tabs`,
`SyntaxHighlighter`, timing charts) and theme files to consume the new
context instead of MUI/Emotion.
2026-08-17 14:04:48 +07:00
..