feat: add better tab view

apps/api/templates/emails/README.md

@@ -60,3 +60,21 @@ Sent by the test button next to a customer's email address.
 |---|---|
 | `{{customerName}}` | Jan Peeters |
 | `{{venueName}}` | Café De Kroon |
+
+### `cash-payment`
+
+Sent to the venue's cash payment addresses (dashboard settings) whenever a tab is paid in cash, on a terminal or on
+the dashboard.
+
+| Placeholder | Example |
+|---|---|
+| `{{customerName}}` | Jan Peeters |
+| `{{venueName}}` | Café De Kroon |
+| `{{amount}}` | € 29,00 |
+| `{{settledAt}}` | 27 oktober 2026 om 22:15 |
+| `{{settledBy}}` | Bar tablet, or the dashboard user's name |
+| `{{#hasItems}}…{{/hasItems}}` | Shown when anything was paid for |
+| `{{#items}}…{{/items}}` | Repeated for each paid line, with: |
+|   `{{quantity}}` | 10 |
+|   `{{productName}}` | Cola |
+|   `{{lineTotal}}` | € 25,00 |

apps/api/templates/emails/cash-payment.html

@@ -0,0 +1,31 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>{{customerName}} betaalde {{amount}} cash bij {{venueName}}</title>
+  </head>
+  <body>
+    <p>De poef van <strong>{{customerName}}</strong> is cash betaald.</p>
+    <table cellpadding="4" cellspacing="0" style="border-collapse: collapse;">
+      <tr><td>Bedrag</td><td style="padding-left: 24px;"><strong>{{amount}}</strong></td></tr>
+      <tr><td>Betaald op</td><td style="padding-left: 24px;">{{settledAt}}</td></tr>
+      <tr><td>Afgerekend door</td><td style="padding-left: 24px;">{{settledBy}}</td></tr>
+    </table>
+    {{#hasItems}}
+    <p>Overzicht:</p>
+    <table cellpadding="4" cellspacing="0" style="border-collapse: collapse;">
+      {{#items}}
+      <tr>
+        <td>{{quantity}}x {{productName}}</td>
+        <td style="text-align: right; padding-left: 24px;">{{lineTotal}}</td>
+      </tr>
+      {{/items}}
+      <tr>
+        <td style="border-top: 1px solid #ccc;"><strong>Totaal</strong></td>
+        <td style="border-top: 1px solid #ccc; text-align: right; padding-left: 24px;"><strong>{{amount}}</strong></td>
+      </tr>
+    </table>
+    {{/hasItems}}
+    <p>{{venueName}}</p>
+  </body>
+</html>

apps/api/templates/emails/cash-payment.txt

@@ -0,0 +1,11 @@
+De poef van {{customerName}} is cash betaald.
+
+Bedrag: {{amount}}
+Betaald op: {{settledAt}}
+Afgerekend door: {{settledBy}}
+{{#hasItems}}
+Overzicht:
+{{#items}}{{quantity}}x {{productName}}  {{lineTotal}}
+{{/items}}Totaal: {{amount}}
+{{/hasItems}}
+{{venueName}}