[Video] Captions and alt text (#5009)

* video settings modal in composer

* show done button on web

* rm download options

* fix logic for showing settings button

* add language picker (wip)

* subtitle list with language select

* send captions & alt text with video when posting

* style "ensure you have selected a language" text

* include aspect ratio with video

* filter out captions where the lang is not set

* rm log

* fix label and add hint

* minor scrubber fix

src/view/com/composer/videos/VideoTranscodeProgress.tsx

@@ -4,6 +4,7 @@ import {View} from 'react-native'
 import ProgressPie from 'react-native-progress/Pie'
 import {ImagePickerAsset} from 'expo-image-picker'
 
+import {isWeb} from '#/platform/detection'
 import {atoms as a, useTheme} from '#/alf'
 import {ExternalEmbedRemoveBtn} from '../ExternalEmbedRemoveBtn'
 import {VideoTranscodeBackdrop} from './VideoTranscodeBackdrop'
@@ -21,6 +22,8 @@ export function VideoTranscodeProgress({
 
   const aspectRatio = asset.width / asset.height
 
+  if (isWeb) return null
+
   return (
     <View
       style={[