Small fixes for annotation card styles

- Collapsed threads don't show tags
- Collapsed threads should have space between user and reply count
- "Sign in required" card should have symmetric vertical margins

h/static/styles/annotations.scss

@@ -184,6 +184,7 @@ privacy {
 
     .annotation-collapsed-replies {
       display: inline;
+      margin-left: .25em;
     }
   }
 }

h/static/styles/threads.scss

@@ -63,12 +63,9 @@ $thread-padding: 1em;
   }
 }
 
-.thread-message {
-  margin-bottom: .5em;
-}
-
+.thread-message,
 .thread-deleted {
-  margin: .8em 0;
+  margin: .5em 0;
 }
 
 .thread-load-more {

h/templates/client/annotation.html

@@ -103,7 +103,7 @@
     </tags-input>
   </div>
 
-  <div class="annotation-section tags tags-read-only"
+  <div class="annotation-body tags tags-read-only"
        ng-if="vm.annotation.tags.length && !vm.editing">
     <ul class="tag-list">
       <li class="tag-item" ng-repeat="tag in vm.annotation.tags">