Setup the foundation for Twenty UI library. (#4423)

* feat: create a separate package for twenty-ui, extract the pill component with hard-coded theme values into it, and use the component inside twenty-front to complete the setup

* feat: extract the light and the dark theme into twenty-ui and update the AppThemeProvider component inside twenty-front to consume themes from twenty-ui

* fix: create a decorator inside preview.tsx to provide a default theme to storybook development server

* fix: remove redundant type declarations and revert back the naming convention for theme declarations

* fix: introduce a default value for pill label within the story for development server

* fix: introduce the nx script into package.json for twenty-ui and resolve imports for theme type within the package

* fix: remove the pill component from the twenty-front package along with the story for it

* fix: revert the package versions to those before running the nx cli command for storybook init

* feat: update readme to include details for building the ui library and starting the storybook development server

* fix: include details about twenty-ui inside jest.config for twenty-front to complete front-jest job

* - Added preview head for font
- Added theme addon for light/dark switch
- Added ComponentDecorator

---------

Co-authored-by: Lucas Bordeau <bordeau.lucas@gmail.com>

packages/twenty-ui/src/components/Pill/Pill.stories.ts

@@ -0,0 +1,20 @@
+import { Meta, StoryObj } from '@storybook/react';
+
+import { ComponentDecorator } from '../../testing/decorators/ComponentDecorator';
+
+import { Pill } from './Pill';
+
+const meta: Meta<typeof Pill> = {
+  title: 'UI/Display/Pill/Pill',
+  component: Pill,
+};
+
+export default meta;
+type Story = StoryObj<typeof Pill>;
+
+export const Default: Story = {
+  args: {
+    label: 'Soon',
+  },
+  decorators: [ComponentDecorator],
+};

packages/twenty-ui/src/components/Pill/Pill.tsx

@@ -0,0 +1,27 @@
+import * as React from 'react';
+import styled from '@emotion/styled';
+
+type PillProps = {
+  className?: string;
+  label?: string;
+};
+
+const StyledPill = styled.span`
+  align-items: center;
+  background: ${({ theme }) => theme.background.transparent.light};
+  border-radius: ${({ theme }) => theme.border.radius.pill};
+  color: ${({ theme }) => theme.font.color.light};
+  display: inline-block;
+  font-size: ${({ theme }) => theme.font.size.xs};
+  font-style: normal;
+  font-weight: ${({ theme }) => theme.font.weight.medium};
+  gap: ${({ theme }) => theme.spacing(2)};
+  height: ${({ theme }) => theme.spacing(4)};
+  justify-content: flex-end;
+  line-height: ${({ theme }) => theme.text.lineHeight.lg};
+  padding: ${({ theme }) => `0 ${theme.spacing(2)}`};
+`;
+
+export const Pill = ({ className, label }: PillProps) => {
+  return <StyledPill className={className}>{label}</StyledPill>;
+};

packages/twenty-ui/src/components/index.ts

@@ -0,0 +1 @@
+export { Pill } from './Pill/Pill';