feat: change email template + add list of items

apps/api/templates/emails/README.md

@@ -16,6 +16,25 @@ Write `{{name}}` to insert a value. Values are HTML-escaped in the `.html` file
 and inserted as-is in the `.txt` file. A placeholder without a value stops the email from being sent,
 so a typo never reaches a customer.
 
+### Blocks
+
+`{{#name}} ... {{/name}}` does one of two things, depending on the value:
+
+- **A list** repeats the block once per item. Inside it you can use that item's placeholders
+  (and every placeholder from outside the block).
+- **Anything else** shows the block only when the value is set (e.g. `true`), and hides it otherwise.
+
+```html
+{{#hasItems}}
+<p>Overzicht van je poef:</p>
+<table>
+  {{#items}}<tr><td>{{quantity}}x {{productName}}</td><td>{{lineTotal}}</td></tr>{{/items}}
+</table>
+{{/hasItems}}
+```
+
+Amounts are already formatted the Belgian way (`€ 25,00`).
+
 ### `payment-reminder`
 
 Sent by "Send reminders" to customers with an unpaid balance.
@@ -24,8 +43,14 @@ Sent by "Send reminders" to customers with an unpaid balance.
 |---|---|
 | `{{customerName}}` | Jan Peeters |
 | `{{venueName}}` | Café De Kroon |
-| `{{amount}}` | €12.50 |
-| `{{itemCount}}` | 3 |
+| `{{amount}}` | € 29,00 |
+| `{{itemCount}}` | 12 |
+| `{{#hasItems}}…{{/hasItems}}` | Shown when the tab's lines are known. Terminals on an older app version don't report them. |
+| `{{#items}}…{{/items}}` | Repeated for each line on the tab, with: |
+| &nbsp;&nbsp;`{{quantity}}` | 10 |
+| &nbsp;&nbsp;`{{productName}}` | Cola |
+| &nbsp;&nbsp;`{{unitPrice}}` | € 2,50 |
+| &nbsp;&nbsp;`{{lineTotal}}` | € 25,00 |
 
 ### `test-email`