Support remaining pieces in completions and scoreboards

app/views/completions/_form.html.slim

@@ -9,14 +9,9 @@
             = @message.author
           br
           = @message.text
-    .row
-      .col
-        h4 = t("completions.singular").capitalize
-  .row.mb-3
+  .row
     .col
-      .form-floating
-        = form.text_field :display_time_from_start, autocomplete: "off", class: "form-control"
-        = form.label :display_time_from_start, class: "required"
+      h4 = t("completions.singular").capitalize
   .row.mb-3
     .col
       .form-floating
@@ -36,6 +31,18 @@
     = form.hidden_field :puzzle_id, value: @puzzles.first.id
   - else
     = form.hidden_field :puzzle_id
+  .row.mb-3
+    .col
+      .form-floating
+        = form.text_field :display_time_from_start, autocomplete: "off", class: "form-control"
+        = form.label :display_time_from_start, class: "required"
+  .row.mb-3
+    .col
+      .form-floating
+        = form.text_field :remaining_pieces, autocomplete: "off", class: "form-control"
+        = form.label :remaining_pieces
+      .form-text
+        = t("activerecord.attributes.completion.remaining_pieces_description")
   .row
     .col
       = form.submit submit_text, class: "btn btn-primary"