重构：改进各种模块中的日志记录和错误处理

example/src/main.cpp

@@ -10,6 +10,7 @@
 #include "widget/panel_widget/mbox.h"
 
 #include "utf8.h"
+#include "misc/log_util.h"
 #include "widget/leaf_widget/meditable_text_box.h"
 #include "widget/panel_widget/moverlay.h"
 
@@ -35,11 +36,11 @@ void test_color() {
 
 	for (const char* test_str: test_cases) {
 		std::optional<linear_color> color = linear_color::from_string(test_str);
-		std::println(std::cout, "Parsing '{}': ", test_str);
+		log_info("Parsing '{}': ", test_str);
 		if (color) {
-			std::println(std::cout, "Success -> r:{}, g:{}, b:{}, a:{}", color->r, color->g, color->b, color->a);
+			log_info("Success -> r:{}, g:{}, b:{}, a:{}", color->r, color->g, color->b, color->a);
 		}
-		else { std::println(std::cerr, "Failed to parse color string: {}", test_str); }
+		else { log_info("Failed to parse color string: {}", test_str); }
 	}
 }