Adjusts surface value for light theme
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Style**
* Refined the light theme’s color tuning (including a small adjustment
to chroma) and retuned the canvas surface tone.
* Updated code block light-theme styling so string literal token colors
are now `#c46a0a` (applied consistently across the design system, docs,
learning, and UI library).
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
## I have read the
[CONTRIBUTING.md](https://github.com/supabase/supabase/blob/master/CONTRIBUTING.md)
file.
YES/NO
## What kind of change does this PR introduce?
Bug fix, feature, docs update, ...
## What is the current behavior?
Please link any relevant issues here.
## What is the new behavior?
Feel free to include screenshots if it includes visual changes.
## Additional context
Add any other context or screenshots.
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Refreshed theming across the UI to use modern color expressions and
shared theme variables (including OKLCH-based gradients), improving
consistency for charts, code blocks, overlays, icons, and decorative
backgrounds.
* **Bug Fixes**
* Improved light/dark color and gradient consistency across axis/grid
styling, reference lines, buttons/badges, sidebar accents, loaders, and
other visual components.
* **Documentation**
* Updated styling/theming guidance to align with the revised semantic
token system and the updated theme variable usage patterns.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
---------
Co-authored-by: Claude Opus 4.8 <[email protected]>
# Changes
## Removed unused themes
- Deleted `concept-two.css` (unused) and `dark-combined.css` which was
identical to `dark.css`
- Removed the alias `deep-dark` to `dark` theme since it was unused
## Removed Figma token transform scripts
- Deleted the entire `internals/transform/` directory (~700 lines of JS)
— these scripts transformed Figma tokens into Tailwind variables but are
no longer needed
- Deleted `internals/tokens/cleanse-css-for-tailwind.js` and
`extract-design-tokens.js`
- Removed related dependencies from `package.json`
## Removed other unused files
- Deleted `shadcn.css` (unused)
- Deleted `tailwind-theming.md` (outdated doc),
https://supabase.com/design-system/docs/color-usage is a better resource
## Refactoring
- Extracted the `motion-safe-transition` Tailwind plugin into its own
file (`packages/config/tailwind-plugins/motion-safe-transition.js`)
- Renamed the tailwind class generation script for clarity
- Added stub `tailwind.config.js` files in packages that were missing
them, so VSCode IntelliSense works in those workspaces
- Updated `packages/ui/README.md` to reflect current usage patterns
(imports, styling conventions) instead of outdated Figma tokens workflow
# Testing
- Check all apps whether they have the correct themes with the correct
colors
[Linear
task](https://linear.app/supabase/issue/FE-3059/clean-up-unused-ui-build-artifacts-themes-and-figma-token-scripts)
