Merge pull request #115 from keyxmakerx/claude/fix-navbar-features-page-8RZuE

fix: apply De Morgan's law to satisfy staticcheck QF1001

Author: keyxmakerx

internal/plugins/campaigns/service.go

@@ -719,7 +719,7 @@ func isValidHexColor(s string) bool {
 		return false
 	}
 	for _, c := range s[1:] {
-		if !((c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F')) {
+		if (c < '0' || c > '9') && (c < 'a' || c > 'f') && (c < 'A' || c > 'F') {
 			return false
 		}
 	}