Add channel{Name,Handle,Thumbnails} to community posts

As requested on [Discord](https://discord.com/channels/933841502155706418/933841503103627316/1226216245897203832).

Like
9a607a3#diff-e097171af35afc2da471ac9f44bd313783d077a0a97bcc61205278d83413a47aR398-R400.

common.php

@@ -394,6 +394,9 @@ function getCommunityPostFromContent($content)
         $post = [
             'id' => $id,
             'channelId' => $channelId,
+            'channelName' => $common['authorText']['runs'][0]['text'],
+            'channelHandle' => substr($common['authorEndpoint']['browseEndpoint']['canonicalBaseUrl'], 1),
+            'channelThumbnails' => $common['authorThumbnail']['thumbnails'],
             'date' => $date,
             'contentText' => $contentText,
             'likes' => $likes,