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/.storybook/main.tsx

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+import { StorybookConfig } from '@storybook/react-vite';
+
+const config: StorybookConfig = {
+  stories: ['../src/**/*.stories.@(js|jsx|ts|tsx|mdx)'],
+  addons: [
+    '@storybook/addon-essentials',
+    '@storybook/addon-interactions',
+    '@storybook/addon-themes',
+  ],
+  framework: {
+    name: '@storybook/react-vite',
+    options: {
+      builder: {
+        viteConfigPath: 'vite.config.ts',
+      },
+    },
+  },
+};
+
+export default config;
+
+// To customize your Vite configuration you can use the viteFinal field.
+// Check https://storybook.js.org/docs/react/builders/vite#configuration
+// and https://nx.dev/recipes/storybook/custom-builder-configs

packages/twenty-ui/.storybook/preview-head.html

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+<link
+  href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&display=swap"
+  rel="stylesheet"
+/>
+
+<script src="https://cdnjs.cloudflare.com/ajax/libs/iframe-resizer/4.3.7/iframeResizer.contentWindow.min.js"></script>
+
+<style type="text/css">
+body {
+  margin: 0;
+  font-family: 'Inter', sans-serif;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+html {
+  font-size: 13px;
+}
+.sbdocs-wrapper {
+  padding: 0 !important;
+}
+*::-webkit-scrollbar {
+    height: 4px;
+    width: 4px;
+  }
+
+  *::-webkit-scrollbar-corner {
+    background-color: transparent;
+  }
+
+  *::-webkit-scrollbar-thumb {
+    background-color: transparent;
+    border-radius: 2px;
+  }
+</style>

packages/twenty-ui/.storybook/preview.tsx

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+import { ThemeProvider } from '@emotion/react';
+import { withThemeFromJSXProvider } from '@storybook/addon-themes';
+import { Preview, ReactRenderer } from '@storybook/react';
+
+import { THEME_DARK, THEME_LIGHT } from '../src/theme/index';
+
+const preview: Preview = {
+  // TODO: Add toggle for darkTheme.
+  decorators: [
+    withThemeFromJSXProvider<ReactRenderer>({
+      themes: {
+        light: THEME_LIGHT,
+        dark: THEME_DARK,
+      },
+      defaultTheme: 'light',
+      Provider: ThemeProvider,
+    }),
+  ],
+};
+
+export default preview;