Reorganize twenty-ui into best-practice component domains and per-component folders (#21745)

Reorganizes `twenty-ui`'s component organization to follow how the best
UI libraries (MUI, Mantine, Base UI, Polaris) structure their source,
now that the package has stabilized.

**Taxonomy** — dissolves the meaningless `components/` junk-drawer and
the 107-file `display/` mega-category. New domains/subpaths:
`data-display`, `typography`, `icon`, `surfaces`; `feedback` and
`layout` absorb the rest (banners/callout/info + placeholders →
feedback; modal/card → surfaces; motion + separators → layout).

**Per-component layout** — every component is now
`<domain>/<ComponentName>/<ComponentName>.tsx` with colocated
styles/stories/types, `internal/` for private helpers and `parts/` for
re-exported compound sub-parts. The redundant inner `/components/` is
gone. `icon` and `json-visualizer` are kept as cohesive subsystems.

**Also:** adds a tree-shakeable root barrel (`import { Button } from
'twenty-ui'`), the generator now owns `individual-entry.ts`, and a real
barrel-leak bug is fixed (private `internals/` parts were leaking into
the public API).

Consumer imports (~1.2k files) and the `twenty-sdk` UI aggregator were
updated by codemod. The change is **export-neutral** except 16
intentionally-removed private internals symbols (all verified
unconsumed). Gates green: typecheck, lint, build, size-limit, storybook.


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packages/twenty-ui/src/input/ButtonGroup/ButtonGroup.module.scss

@@ -0,0 +1,4 @@
+.container {
+  border-radius: var(--t-border-radius-md);
+  display: flex;
+}

packages/twenty-ui/src/input/ButtonGroup/ButtonGroup.module.scss.d.ts

@@ -0,0 +1,4 @@
+declare const classNames: {
+  readonly container: 'container';
+};
+export default classNames;

packages/twenty-ui/src/input/ButtonGroup/ButtonGroup.tsx

@@ -0,0 +1,57 @@
+import { clsx } from 'clsx';
+import React, { type ReactNode } from 'react';
+import { isDefined } from '@ui/utilities/utils/isDefined';
+
+import { type ButtonPosition, type ButtonProps } from '@ui/input/Button/Button';
+
+import styles from './ButtonGroup.module.scss';
+
+export type ButtonGroupProps = Partial<
+  Pick<ButtonProps, 'variant' | 'size' | 'accent'>
+> & {
+  className?: string;
+  children: ReactNode[];
+};
+
+export const ButtonGroup = ({
+  className,
+  children,
+  variant,
+  size,
+  accent,
+}: ButtonGroupProps) => {
+  return (
+    <div className={clsx(styles.container, className)}>
+      {React.Children.map(children, (child, index) => {
+        if (!React.isValidElement(child)) return null;
+
+        let position: ButtonPosition;
+
+        if (index === 0) {
+          position = 'left';
+        } else if (index === children.length - 1) {
+          position = 'right';
+        } else {
+          position = 'middle';
+        }
+
+        // eslint-disable-next-line @typescript-eslint/no-explicit-any
+        const additionalProps: any = { position, variant, accent, size };
+
+        if (isDefined(variant)) {
+          additionalProps.variant = variant;
+        }
+
+        if (isDefined(accent)) {
+          additionalProps.accent = accent;
+        }
+
+        if (isDefined(size)) {
+          additionalProps.size = size;
+        }
+
+        return React.cloneElement(child, additionalProps);
+      })}
+    </div>
+  );
+};

packages/twenty-ui/src/input/ButtonGroup/__stories__/ButtonGroup.stories.tsx

@@ -0,0 +1,86 @@
+import { type Meta, type StoryObj } from '@storybook/react-vite';
+import { IconCheckbox, IconNotes, IconTimelineEvent } from '@ui/icon';
+import {
+  CatalogDecorator,
+  type CatalogStory,
+  ComponentDecorator,
+} from '@ui/testing';
+import {
+  Button,
+  type ButtonAccent,
+  type ButtonSize,
+  type ButtonVariant,
+} from '@ui/input/Button/Button';
+import { ButtonGroup } from '@ui/input/ButtonGroup/ButtonGroup';
+
+const meta: Meta<typeof ButtonGroup> = {
+  title: 'UI/Input/Button/ButtonGroup',
+  component: ButtonGroup,
+};
+
+export default meta;
+type Story = StoryObj<typeof ButtonGroup>;
+
+export const Default: Story = {
+  // TODO(a11y): violations inherited from deprecated story; fix during a11y pass
+  parameters: { a11y: { test: 'todo' } },
+  args: {
+    size: 'small',
+    variant: 'primary',
+    accent: 'danger',
+    children: [
+      <Button key="note" Icon={IconNotes} title="Note" />,
+      <Button key="task" Icon={IconCheckbox} title="Task" />,
+      <Button key="activity" Icon={IconTimelineEvent} title="Activity" />,
+    ],
+  },
+  argTypes: {
+    children: { control: false },
+  },
+  decorators: [ComponentDecorator],
+};
+
+export const Catalog: CatalogStory<Story, typeof ButtonGroup> = {
+  args: {
+    children: [
+      <Button key="note" Icon={IconNotes} title="Note" />,
+      <Button key="task" Icon={IconCheckbox} title="Task" />,
+      <Button key="activity" Icon={IconTimelineEvent} title="Activity" />,
+    ],
+  },
+  argTypes: {
+    size: { control: false },
+    variant: { control: false },
+    accent: { control: false },
+    children: { control: false },
+  },
+  parameters: {
+    // TODO(a11y): violations inherited from deprecated story; fix during a11y pass
+    a11y: { test: 'todo' },
+    pseudo: { hover: ['.hover'], active: ['.pressed'], focus: ['.focus'] },
+    catalog: {
+      dimensions: [
+        {
+          name: 'sizes',
+          values: ['small', 'medium'] satisfies ButtonSize[],
+          props: (size: ButtonSize) => ({ size }),
+        },
+        {
+          name: 'accents',
+          values: ['default', 'blue', 'danger'] satisfies ButtonAccent[],
+          props: (accent: ButtonAccent) => ({ accent }),
+        },
+        {
+          name: 'variants',
+          values: [
+            'primary',
+            'secondary',
+            'tertiary',
+          ] satisfies ButtonVariant[],
+          props: (variant: ButtonVariant) => ({ variant }),
+        },
+      ],
+    },
+  },
+  decorators: [CatalogDecorator],
+};