Hide sensitive image in default on the public pages (#5009)

Additionally, this restores previous background / text color for media spoiler.

app/javascript/styles/stream_entries.scss

@@ -243,6 +243,19 @@
     }
   }
 
+  .media-spoiler {
+    background: $ui-primary-color;
+    color: $white;
+    transition: all 100ms linear;
+
+    &:hover,
+    &:active,
+    &:focus {
+      background: darken($ui-primary-color, 5%);
+      color: unset;
+    }
+  }
+
   .pre-header {
     padding: 14px 0;
     padding-left: (48px + 14px * 2);

app/views/stream_entries/_detailed_status.html.haml

@@ -24,7 +24,7 @@
       - video = status.media_attachments.first
       %div{ data: { component: 'Video', props: Oj.dump(src: video.file.url(:original), preview: video.file.url(:small), sensitive: status.sensitive?, width: 670, height: 380) }}
     - else
-      %div{ data: { component: 'MediaGallery', props: Oj.dump(height: 380, 'autoPlayGif': current_account&.user&.setting_auto_play_gif, media: status.media_attachments.map { |a| ActiveModelSerializers::SerializableResource.new(a, serializer: REST::MediaAttachmentSerializer).as_json }) }}
+      %div{ data: { component: 'MediaGallery', props: Oj.dump(height: 380, sensitive: status.sensitive?, 'autoPlayGif': current_account&.user&.setting_auto_play_gif, media: status.media_attachments.map { |a| ActiveModelSerializers::SerializableResource.new(a, serializer: REST::MediaAttachmentSerializer).as_json }) }}
   - elsif status.preview_cards.first
     %div{ data: { component: 'Card', props: Oj.dump('maxDescription': 160, card: ActiveModelSerializers::SerializableResource.new(status.preview_cards.first, serializer: REST::PreviewCardSerializer).as_json) }}
 

app/views/stream_entries/_simple_status.html.haml

@@ -25,4 +25,4 @@
       - video = status.media_attachments.first
       %div{ data: { component: 'Video', props: Oj.dump(src: video.file.url(:original), preview: video.file.url(:small), sensitive: status.sensitive?, width: 610, height: 343) }}
     - else
-      %div{ data: { component: 'MediaGallery', props: Oj.dump(height: 343, 'autoPlayGif': current_account&.user&.setting_auto_play_gif, media: status.media_attachments.map { |a| ActiveModelSerializers::SerializableResource.new(a, serializer: REST::MediaAttachmentSerializer).as_json }) }}
+      %div{ data: { component: 'MediaGallery', props: Oj.dump(height: 343, sensitive: status.sensitive?, 'autoPlayGif': current_account&.user&.setting_auto_play_gif, media: status.media_attachments.map { |a| ActiveModelSerializers::SerializableResource.new(a, serializer: REST::MediaAttachmentSerializer).as_json }) }}