fix(ui): display user-friendly message for range error (#7420)

- Instead of displaying 'RangeError: Range' display 'x must be a number between $MIN and $MAX' when the validation fails for a range error check.
- Resolves forgejo/forgejo#3510
- Added integration testing.

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/7420
Reviewed-by: 0ko <0ko@noreply.codeberg.org>
Co-authored-by: Gusted <postmaster@gusted.xyz>
Co-committed-by: Gusted <postmaster@gusted.xyz>

modules/web/middleware/binding.go

@@ -79,6 +79,11 @@ func GetInclude(field reflect.StructField) string {
 	return getRuleBody(field, "Include(")
 }
 
+func GetRange(field reflect.StructField) (string, string) {
+	min, max, _ := strings.Cut(getRuleBody(field, "Range("), ",")
+	return min, max
+}
+
 // Validate populates the data with validation error (if any).
 func Validate(errs binding.Errors, data map[string]any, f any, l translation.Locale) binding.Errors {
 	if errs.Len() == 0 {
@@ -131,6 +136,9 @@ func Validate(errs binding.Errors, data map[string]any, f any, l translation.Loc
 				data["ErrorMsg"] = trName + l.TrString("form.url_error", errs[0].Message)
 			case binding.ERR_INCLUDE:
 				data["ErrorMsg"] = trName + l.TrString("form.include_error", GetInclude(field))
+			case binding.ERR_RANGE:
+				min, max := GetRange(field)
+				data["ErrorMsg"] = trName + l.TrString("alert.range_error", l.PrettyNumber(min), l.PrettyNumber(max))
 			case validation.ErrGlobPattern:
 				data["ErrorMsg"] = trName + l.TrString("form.glob_pattern_error", errs[0].Message)
 			case validation.ErrRegexPattern: