New component library based on ALF (#2459)

* Install on native as well

* Add button and link components

* Comments

* Use new prop

* Add some form elements

* Add labels to input

* Fix line height, add suffix

* Date inputs

* Autofill styles

* Clean up InputDate types

* Improve types for InputText, value handling

* Enforce a11y props on buttons

* Add Dialog, Portal

* Dialog contents

* Native dialog

* Clean up

* Fix animations

* Improvements to web modal, exiting still broken

* Clean up dialog types

* Add Prompt, Dialog refinement, mobile refinement

* Integrate new design tokens, reorg storybook

* Button colors

* Dim mode

* Reorg

* Some styles

* Toggles

* Improve a11y

* Autosize dialog, handle max height, Dialog.ScrolLView not working

* Try to use BottomSheet's own APIs

* Scrollable dialogs

* Add web shadow

* Handle overscroll

* Styles

* Dialog text input

* Shadows

* Button focus states

* Button pressed states

* Gradient poc

* Gradient colors and hovers

* Add hrefAttrs to Link

* Some more a11y

* Toggle invalid states

* Update dialog descriptions for demo

* Icons

* WIP Toggle cleanup

* Refactor toggle to not rely on immediate children

* Make Toggle controlled

* Clean up Toggles storybook

* ToggleButton styles

* Improve a11y labels

* ToggleButton hover darkmode

* Some i18n

* Refactor input

* Allow extension of input

* Remove old input

* Improve icons, add CalendarDays

* Refactor DateField, web done

* Add label example

* Clean up old InputDate, DateField android, text area example

* Consistent imports

* Button context, icons

* Add todo

* Add closeAllDialogs control

* Alignment

* Expand color palette

* Hitslops, add shortcut to Storybook in dev

* Fix multiline on ios

* Mark dialog close button as unused

src/components/Portal.tsx

@@ -0,0 +1,56 @@
+import React from 'react'
+
+type Component = React.ReactElement
+
+type ContextType = {
+  outlet: Component | null
+  append(id: string, component: Component): void
+  remove(id: string): void
+}
+
+type ComponentMap = {
+  [id: string]: Component
+}
+
+export const Context = React.createContext<ContextType>({
+  outlet: null,
+  append: () => {},
+  remove: () => {},
+})
+
+export function Provider(props: React.PropsWithChildren<{}>) {
+  const map = React.useRef<ComponentMap>({})
+  const [outlet, setOutlet] = React.useState<ContextType['outlet']>(null)
+
+  const append = React.useCallback<ContextType['append']>((id, component) => {
+    if (map.current[id]) return
+    map.current[id] = <React.Fragment key={id}>{component}</React.Fragment>
+    setOutlet(<>{Object.values(map.current)}</>)
+  }, [])
+
+  const remove = React.useCallback<ContextType['remove']>(id => {
+    delete map.current[id]
+    setOutlet(<>{Object.values(map.current)}</>)
+  }, [])
+
+  return (
+    <Context.Provider value={{outlet, append, remove}}>
+      {props.children}
+    </Context.Provider>
+  )
+}
+
+export function Outlet() {
+  const ctx = React.useContext(Context)
+  return ctx.outlet
+}
+
+export function Portal({children}: React.PropsWithChildren<{}>) {
+  const {append, remove} = React.useContext(Context)
+  const id = React.useId()
+  React.useEffect(() => {
+    append(id, children as Component)
+    return () => remove(id)
+  }, [id, children, append, remove])
+  return null
+}