Add hidden setting to puzzles

#19

app/views/puzzles/_form.html.slim

@@ -21,6 +21,13 @@
       .form-floating
         = form.number_field :pieces, autocomplete: "off", class: "form-control"
         = form.label :pieces, class: "required"
+  .row.mb-3
+    .col
+      .form-check.form-switch
+        = form.check_box :hidden, class: "form-check-input"
+        = form.label :hidden
+      .form-text
+        = t("activerecord.attributes.puzzle.hidden_description")
   .row.mb-3
     .col
       .form-text.mb-1
@@ -42,7 +49,7 @@
         }
 
         setMaxUploadSize();
-  .row.mt-4
+  .row.mt-4.mb-5
     .col
       - if method == :patch
         = link_to t("helpers.buttons.delete"), contest_puzzle_path(contest, puzzle), data: { turbo_method: :delete }, class: "btn btn-danger me-2"

app/views/puzzles/index.html.slim

@@ -16,6 +16,8 @@
             = t("activerecord.attributes.puzzle.brand")
           th
             = t("activerecord.attributes.puzzle.pieces")
+          th
+            = t("activerecord.attributes.puzzle.hidden")
       tbody
         - @puzzles.each do |puzzle|
           tr.align-middle scope="row"
@@ -27,6 +29,12 @@
               = puzzle.brand
             td
               = puzzle.pieces
+            td
+              - if puzzle.hidden?
+                <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
               a.btn.btn-sm.btn-secondary href=edit_contest_puzzle_path(@contest, puzzle)
                 = t("helpers.buttons.edit")