add unread count to thread title in topic view and thread view

app/templates/threads/thread.html

@@ -12,7 +12,7 @@
 {% endif %}
 <main>
   <nav class="darkbg">
-    <h1 class="thread-title">{{ thread.title }}</h1>
+    <h1 class="thread-title">{{ thread.title }}{% if unread_count is not none %} ({{ unread_count }} unread){% endif %}</h1>
     <span>Posted in <a href="{{ url_for("topics.topic", slug=topic.slug) }}">{{ topic.name }}</a>
     {% if thread.is_stickied %}
       &bullet; <i>stickied, so it's probably important</i>

app/templates/topics/topic.html

@@ -40,6 +40,9 @@
       <div class="thread-info-container">
         <span>
           <span class="thread-title"><a href="{{ url_for("threads.thread", slug=thread['slug']) }}">{{thread['title']}}</a></span>
+          {% if thread['id'] in subscriptions %}
+          ({{ subscriptions[thread['id']] }} unread)
+          {% endif %}
           &bullet;
           Started by <a href="{{ url_for("users.page", username=thread['started_by']) }}">{{ thread['started_by'] }}</a> on {{ timestamp(thread['created_at'])}}
         </span>