feat(template): add user_id to HtmlPageContext and delete button to diary

crates/adapters/template-askama/templates/diary.html

@@ -21,6 +21,13 @@
       <div class="comment">{{ comment.value() }}</div>
       {% endif %}
       <div class="watched-at">{{ entry.review().watched_at().format("%Y-%m-%d") }}</div>
+      {% if let Some(uid) = ctx.user_id %}
+        {% if *uid == entry.review().user_id().value() %}
+        <form method="post" action="/reviews/{{ entry.review().id().value() }}/delete">
+          <button type="submit">Delete</button>
+        </form>
+        {% endif %}
+      {% endif %}
     </div>
   </article>
   {% else %}