Add library entry point and package exports for consumption

Add src/index.ts barrel export re-exporting all components, types, and
utilities. Configure package.json with main, exports (root, tokens,
utils), peerDependencies for react/react-dom, and bump to 0.1.0.
Consumers can now install via local path and import directly:

  import { Button, AppShell, cn } from 'ads3-design-system'
  import 'ads3-design-system/tokens'

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/index.ts

@@ -0,0 +1,143 @@
+// Utilities
+export { cn } from './lib/utils'
+
+// Atoms
+export { Button } from './components/atoms/Button'
+export type { ButtonProps } from './components/atoms/Button'
+
+export { IconButton } from './components/atoms/IconButton'
+export type { IconButtonProps } from './components/atoms/IconButton'
+
+export { Input } from './components/atoms/Input'
+export type { InputProps } from './components/atoms/Input'
+
+export { Textarea } from './components/atoms/Textarea'
+export type { TextareaProps } from './components/atoms/Textarea'
+
+export { Select } from './components/atoms/Select'
+export type { SelectProps, SelectOption } from './components/atoms/Select'
+
+export { Autocomplete } from './components/atoms/Autocomplete'
+export type { AutocompleteProps, AutocompleteOption } from './components/atoms/Autocomplete'
+
+export { Checkbox } from './components/atoms/Checkbox'
+export type { CheckboxProps } from './components/atoms/Checkbox'
+
+export { Radio, RadioGroup } from './components/atoms/Radio'
+export type { RadioProps, RadioGroupProps } from './components/atoms/Radio'
+
+export { Switch } from './components/atoms/Switch'
+export type { SwitchProps } from './components/atoms/Switch'
+
+export { Slider, RangeSlider } from './components/atoms/Slider'
+export type { SliderProps, RangeSliderProps } from './components/atoms/Slider'
+
+export { FileInput } from './components/atoms/FileInput'
+export type { FileInputProps } from './components/atoms/FileInput'
+
+export { Badge } from './components/atoms/Badge'
+export type { BadgeProps } from './components/atoms/Badge'
+
+export { Tag } from './components/atoms/Tag'
+export type { TagProps, TagColor } from './components/atoms/Tag'
+
+export { Chip } from './components/atoms/Chip'
+export type { ChipProps, ChipColor } from './components/atoms/Chip'
+
+export { Tabs, TabList, Tab, TabPanel } from './components/atoms/Tabs'
+export type { TabsProps, TabListProps, TabProps, TabPanelProps } from './components/atoms/Tabs'
+
+export { List, ListItem, ListSubheader, ListDivider } from './components/atoms/List'
+export type { ListProps, ListItemProps, ListSubheaderProps, ListDividerProps } from './components/atoms/List'
+
+export { Avatar } from './components/atoms/Avatar'
+export type { AvatarProps } from './components/atoms/Avatar'
+
+export { Tooltip } from './components/atoms/Tooltip'
+export type { TooltipProps } from './components/atoms/Tooltip'
+
+// Molecules
+export { Card, CardHeader, CardTitle, CardDescription, CardContent, CardFooter } from './components/molecules/Card'
+export type {
+  CardProps,
+  CardHeaderProps,
+  CardTitleProps,
+  CardDescriptionProps,
+  CardContentProps,
+  CardFooterProps,
+} from './components/molecules/Card'
+
+export { Accordion, AccordionItem, AccordionTrigger, AccordionContent } from './components/molecules/Accordion'
+export type {
+  AccordionProps,
+  AccordionItemProps,
+  AccordionTriggerProps,
+  AccordionContentProps,
+} from './components/molecules/Accordion'
+
+export { Alert } from './components/molecules/Alert'
+export type { AlertProps, AlertVariant } from './components/molecules/Alert'
+
+export {
+  Dialog,
+  DialogHeader,
+  DialogTitle,
+  DialogDescription,
+  DialogContent,
+  DialogFooter,
+  DialogClose,
+} from './components/molecules/Dialog'
+export type {
+  DialogProps,
+  DialogHeaderProps,
+  DialogTitleProps,
+  DialogDescriptionProps,
+  DialogContentProps,
+  DialogFooterProps,
+  DialogCloseProps,
+} from './components/molecules/Dialog'
+
+export { Popover, PopoverTrigger, PopoverContent, PopoverClose } from './components/molecules/Popover'
+export type {
+  PopoverProps,
+  PopoverTriggerProps,
+  PopoverContentProps,
+  PopoverCloseProps,
+} from './components/molecules/Popover'
+
+export { DataTable } from './components/molecules/DataTable'
+export type { DataTableProps, DataTableColumn } from './components/molecules/DataTable'
+
+// Organisms
+export { TopBar } from './components/organisms/TopBar'
+export type { TopBarProps } from './components/organisms/TopBar'
+
+export { SideNav, SideNavItem, SideNavGroup, SideNavDivider } from './components/organisms/SideNav'
+export type {
+  SideNavProps,
+  SideNavItemProps,
+  SideNavGroupProps,
+  SideNavDividerProps,
+} from './components/organisms/SideNav'
+
+export { PageHeader } from './components/organisms/PageHeader'
+export type { PageHeaderProps } from './components/organisms/PageHeader'
+
+// Templates
+export { AppShell } from './components/templates/AppShell'
+export type { AppShellProps } from './components/templates/AppShell'
+
+export { DashboardPage } from './components/templates/DashboardPage'
+export type { DashboardPageProps } from './components/templates/DashboardPage'
+
+export { ListPage } from './components/templates/ListPage'
+export type { ListPageProps } from './components/templates/ListPage'
+
+export { FormPage } from './components/templates/FormPage'
+export type { FormPageProps, FormPageStep } from './components/templates/FormPage'
+
+export { DetailPage } from './components/templates/DetailPage'
+export type { DetailPageProps } from './components/templates/DetailPage'
+
+export { CenteredPage } from './components/templates/CenteredPage'
+export type { CenteredPageProps } from './components/templates/CenteredPage'