Use <Modal> for Composer (#3588)

* use <Modal> to display composer

* trigger `onPressCancel` on modal cancel

* remove android top padding

* use light statusbar on ios

* use KeyboardStickyView from r-n-keyboard-controller

* make extra bottom padding ios-only

* make cancelRef optional

* scope legacy modals

* don't change bg color on ios

* use fullScreen instead of formSheet

* adjust padding on keyboardaccessory to account for new buttons

* Revert "use KeyboardStickyView from r-n-keyboard-controller"

This reverts commit 426c812904.

* fix insets

* tweaks and merge

* revert 89f51c72

* nit

* import keyboard provider

---------

Co-authored-by: Hailey <me@haileyok.com>
Co-authored-by: Dan Abramov <dan.abramov@gmail.com>

src/view/com/composer/KeyboardAccessory.tsx

@@ -0,0 +1,34 @@
+import React from 'react'
+import {View} from 'react-native'
+import {KeyboardStickyView} from 'react-native-keyboard-controller'
+import {useSafeAreaInsets} from 'react-native-safe-area-context'
+
+import {isWeb} from '#/platform/detection'
+import {atoms as a, useTheme} from '#/alf'
+
+export function KeyboardAccessory({children}: {children: React.ReactNode}) {
+  const t = useTheme()
+  const {bottom} = useSafeAreaInsets()
+
+  const style = [
+    a.flex_row,
+    a.py_xs,
+    a.pl_sm,
+    a.pr_xl,
+    a.align_center,
+    a.border_t,
+    t.atoms.border_contrast_medium,
+    t.atoms.bg,
+  ]
+
+  // todo: when iPad support is added, it should also not use the KeyboardStickyView
+  if (isWeb) {
+    return <View style={style}>{children}</View>
+  }
+
+  return (
+    <KeyboardStickyView offset={{closed: -bottom}} style={style}>
+      {children}
+    </KeyboardStickyView>
+  )
+}