Use dropdown for web reposting and quote posting (#607)

* Use dropdown for web reposting and quote posting

* Remove collateral damage

* Tune the repost dropdown positioning

* Move postctrls into their own folder

* Factor out repost button into native/web build

---------

Co-authored-by: Paul Frazee <pfrazee@gmail.com>

src/view/com/util/post-ctrls/RepostButton.web.tsx

@@ -0,0 +1,86 @@
+import React, {useMemo} from 'react'
+import {StyleProp, StyleSheet, View, ViewStyle} from 'react-native'
+import {RepostIcon} from 'lib/icons'
+import {DropdownButton} from '../forms/DropdownButton'
+import {colors} from 'lib/styles'
+import {useTheme} from 'lib/ThemeContext'
+import {Text} from '../text/Text'
+
+interface Props {
+  isReposted: boolean
+  repostCount?: number
+  big?: boolean
+  onRepost: () => void
+  onQuote: () => void
+}
+
+export const RepostButton = ({
+  isReposted,
+  repostCount,
+  big,
+  onRepost,
+  onQuote,
+}: Props) => {
+  const theme = useTheme()
+
+  const defaultControlColor = React.useMemo(
+    () => ({
+      color: theme.palette.default.postCtrl,
+    }),
+    [theme],
+  )
+
+  const items = useMemo(
+    () => [
+      {
+        label: isReposted ? 'Undo repost' : 'Repost',
+        icon: 'retweet' as const,
+        onPress: onRepost,
+      },
+      {label: 'Quote post', icon: 'quote-left' as const, onPress: onQuote},
+    ],
+    [isReposted, onRepost, onQuote],
+  )
+
+  return (
+    <DropdownButton
+      type="bare"
+      items={items}
+      bottomOffset={4}
+      openToRight
+      rightOffset={-40}>
+      <View
+        style={[
+          styles.control,
+          (isReposted
+            ? styles.reposted
+            : defaultControlColor) as StyleProp<ViewStyle>,
+        ]}>
+        <RepostIcon strokeWidth={2.4} size={big ? 24 : 20} />
+        {typeof repostCount !== 'undefined' ? (
+          <Text
+            testID="repostCount"
+            type={isReposted ? 'md-bold' : 'md-medium'}
+            style={styles.repostCount}>
+            {repostCount ?? 0}
+          </Text>
+        ) : undefined}
+      </View>
+    </DropdownButton>
+  )
+}
+
+const styles = StyleSheet.create({
+  control: {
+    display: 'flex',
+    flexDirection: 'row',
+    alignItems: 'center',
+    gap: 4,
+  },
+  reposted: {
+    color: colors.green3,
+  },
+  repostCount: {
+    color: 'currentColor',
+  },
+})