Add indicator for processed messages

app/views/completions/_form.html.slim

@@ -1,5 +1,6 @@
 = form_with model: completion, url: url, method: method do |form|
   - if @message
+    = form.hidden_field :message_id, value: @message.id
     .row.mb-3
       .col
         h4 = t("messages.singular").capitalize

app/views/contests/show.html.slim

@@ -18,7 +18,7 @@
     = link_to "#{message_url}?token=#{@contest.generate_token_for(:token)}"
     
 .row.mb-4
-  .col-6
+  .col-7
     .row
       .col
         h4
@@ -38,7 +38,7 @@
         - @puzzles.each do |puzzle|
           tr.align-middle scope="row"
             td
-              = image_tag(puzzle.image, class: "img-fluid", style: "max-width: 140px;") if puzzle.image.attached?
+              = image_tag(puzzle.image, class: "img-fluid", style: "max-height: 48px;") if puzzle.image.attached?
             td
               = puzzle.name
             td
@@ -57,15 +57,24 @@
       table.table.table-striped.table-hover
         thead
           tr
+            th scope="col" style="white-space: nowrap"
+              = t("activerecord.attributes.message.processed")
             th scope="col"
               = t("activerecord.attributes.message.time")
             th scope="col"
               = t("activerecord.attributes.message.author")
-            th scope="col"
+            th.w-25 scope="col"
               = t("activerecord.attributes.message.text")
+            th.w-25 scope="col"
         tbody
           - @messages.each do |message|
             tr.align-middle scope="row"
+              td style="text-align: center"
+                - if message.completions.size > 0
+                  <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
                 = message.display_time
               td
@@ -81,7 +90,7 @@
                     = t("helpers.buttons.add_completion")
               td
                 = link_to t("helpers.buttons.delete"), contest_message_path(@contest, message), data: { turbo_method: :delete }, class: "btn btn-sm btn-danger"
-  .col-6
+  .col-5
     .row
       .col
         h4