refactor: form binding validation (#38832)

Make "form-fetch-action" highlight the invalid field as "error"

modules/web/router.go

@@ -26,7 +26,7 @@ func Bind[T any](_ T) http.HandlerFunc {
 	return func(resp http.ResponseWriter, req *http.Request) {
 		theObj := new(T) // create a new form obj for every request but not use obj directly
 		data := middleware.GetContextData(req.Context())
-		binding.Bind(req, theObj)
+		_ = binding.Bind(req, theObj) // no need to handle "errs" here, the errors are handled in our middleware.Validate (binding.go)
 		SetForm(data, theObj)
 		middleware.AssignForm(theObj, data)
 	}
@@ -37,6 +37,10 @@ func SetForm(dataStore reqctx.ContextDataProvider, obj any) {
 	dataStore.GetData()["__form"] = obj
 }
 
+func IsFormSet(dataStore reqctx.RequestDataStore) bool {
+	return dataStore.GetData()["__form"] != nil
+}
+
 // GetForm returns the validate form information
 func GetForm[T any](dataStore reqctx.RequestDataStore) T {
 	form, ok := dataStore.GetData()["__form"].(T)