show build on website footer

templates/roll_calculator.html

@@ -60,6 +60,7 @@
     .fc-req-nok { color: #dc3545; font-weight: 600; }
     .formula-box { background: #f8f9fa; border: 1px solid #e0e0e0; border-radius: 6px; padding: 10px 14px; font-size: 12px; color: #666; margin-top: 18px; font-family: 'Courier New', monospace; }
     .footer { text-align: center; font-size: 11px; color: #aaa; padding: 18px; margin-top: 30px; }
+    .footer-build-info { margin-top: 6px; color: #bbb; }
     .disclaimer-overlay {
       position: fixed;
       inset: 0;
@@ -844,6 +845,9 @@
 
 <div class="footer">
   Naue GmbH & Co. KG · Roll Diameter Calculator · Internal Application
+  <div class="footer-build-info">
+    Version {{ build_info.version }} · Branch {{ build_info.branch }} · Commit {{ build_info.commit }} · Built {{ build_info.timestamp }}
+  </div>
 </div>
 
 <script>