Fixing minor stuff, working on Web version

src/UiManager.cpp

@@ -798,14 +798,14 @@ namespace FRG {
 			else {
 				auto buf = readFileFromZIP(path, zipFile);
 				if (buf.empty()) {
-					std::cerr << "UiManager: failed to read " << path << " from zip " << zipFile << std::endl;
+					logger() << "UiManager: failed to read " << path << " from zip " << zipFile << std::endl;
 					throw std::runtime_error("Failed to load UI file: " + path);
 				}
 				content.assign(buf.begin(), buf.end());
 			}
 		}
 		catch (const std::exception& e) {
-			std::cerr << "UiManager: failed to open " << path << " : " << e.what() << std::endl;
+			logger() << "UiManager: failed to open " << path << " : " << e.what() << std::endl;
 			throw std::runtime_error("Failed to load UI file: " + path);
 		}
 
@@ -814,12 +814,12 @@ namespace FRG {
 			j = json::parse(content);
 		}
 		catch (const std::exception& e) {
-			std::cerr << "UiManager: json parse error: " << e.what() << std::endl;
+			logger() << "UiManager: json parse error: " << e.what() << std::endl;
 			throw std::runtime_error("Failed to load UI file: " + path);
 		}
 
 		if (!j.contains("root") || !j["root"].is_object()) {
-			std::cerr << "UiManager: root node missing or invalid" << std::endl;
+			logger() << "UiManager: root node missing or invalid" << std::endl;
 			throw std::runtime_error("Failed to load UI file: " + path);
 		}