fix: what is agh (#1183)

* fix: what is agh

* fix: show json

---------

Co-authored-by: Echo <github@3kh0.net>

Author: NeonGamerBot-QK

app/views/admin/shop_items/_form.html.erb

@@ -237,8 +237,12 @@
           <h3>Warehouse Settings</h3>
           <div class="shop-item-form__field">
             <%= f.label :agh_contents, "AGH Contents (JSON)", class: "shop-item-form__label" %>
-            <%= f.text_area :agh_contents, rows: 4, id: "shop_item_agh_contents", class: "form-control shop-item-form__code", placeholder: '[{"sku": "ITEM-001", "quantity": 1}]' %>
+            <%= f.text_area :agh_contents, rows: 4, id: "shop_item_agh_contents", class: "form-control shop-item-form__code", placeholder: '[{"sku": "ITEM-001", "quantity": 1}]', value: shop_item.agh_contents.present? ? JSON.pretty_generate(shop_item.agh_contents) : '' %>
             <span class="shop-item-form__hint">List SKUs to include. Quantity selected by user will batch all SKUs together.</span>
+            <div class="alert alert-warning" style="margin-top: 0.5rem;">
+              <strong>Required:</strong> This field must contain valid JSON (not Ruby hash syntax).
+              Use double quotes for keys and strings. <a href="https://github.com/hackclub/flavortown/issues/1172" target="_blank" rel="noopener">See issue #1172 for more info</a>.
+            </div>
           </div>
         </div>