Show offline contestants in dashboard

app/views/contests/show.html.slim

@@ -75,10 +75,10 @@ javascript:
       table.table.table-striped.table-hover
         thead
           tr
-            th
-              = t("helpers.rank")
             th
               = t("activerecord.attributes.contestant.name")
+            th
+              = t("activerecord.attributes.contestant.offline")
             th
               = t("activerecord.attributes.contestant.completions")
             th
@@ -86,10 +86,14 @@ javascript:
         tbody
           - @contestants.each_with_index do |contestant, index|
             tr scope="row"
-              td
-                = index + 1
               td
                 = contestant.name
+              td
+                - if contestant.offline.present?
+                  <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-check-square" viewBox="0 0 16 16">
+                    <path d="M14 1a1 1 0 0 1 1 1v12a1 1 0 0 1-1 1H2a1 1 0 0 1-1-1V2a1 1 0 0 1 1-1zM2 0a2 2 0 0 0-2 2v12a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V2a2 2 0 0 0-2-2z"/>
+                    <path d="M10.97 4.97a.75.75 0 0 1 1.071 1.05l-3.992 4.99a.75.75 0 0 1-1.08.02L4.324 8.384a.75.75 0 1 1 1.06-1.06l2.094 2.093 3.473-4.425z"/>
+                  </svg>
               td
                 = contestant.completions.where(remaining_pieces: nil).length
               td