Update requirement files with new feature templates and fix backend API error message, along with mobile project config updates and documentation improvements

01_Requirements/REQ0142/index.md

@@ -1 +1,25 @@
-# DemoReactCalculator
+---
+tags: [requirements]
+---
+
+# REQ0142-DemoReactCalculator
+
+## Description
+
+![React Calculator](React%20Calculator.png)
+
+## Schema
+
+```dbml
+// Add your DBML here
+Table calculations {
+  id integer
+  expression string
+  result float
+  timestamp datetime
+}
+```
+
+## Related
+
+- [REQ0141-DemoReactAddToCart](#)