Back to single-select form w/ multiple select actions

app/helpers/quantities_helper.rb

@@ -1,7 +1,17 @@
 module QuantitiesHelper
-  def quantity_options(quantities, selected: nil)
-    values = quantities.map { |q| [sanitize(' ' * q.depth + q.name), q.id] }
-    values.unshift([t('.select_quantity'), nil, {hidden: true}])
-    options_for_select(values, selected: selected)
+  def quantity_option_text(quantity, checked = nil)
+    prefix = case checked
+             when true
+               # Use color and gray unicode emoji to assure same width.
+               # Avoid shapes similar to inputs (chackboxes, radio buttons etc.)
+               # (U+27A1 U+FE0F)/U+1F7E6/U+2705/U+1F499 U+2004
+               '💙 '
+             when false
+               # U+2B1C/U+1F90D U+2004
+               '🤍 '
+             else
+               ''
+             end
+    sanitize(' ' * quantity.depth + prefix + quantity.name)
   end
 end