fix: 添加iupcd链接并调整列表样式

- 在Makefile的LDFLAGS中添加-liupcd库链接，确保编译时正确链接
- 调整主界面中IupFlatList的视觉样式：修改分隔线颜色为深灰，添加白色背景、边框和焦点支持，提升用户体验

Makefile

@@ -15,7 +15,7 @@ BIN_DIR = bin
 # -mwindows: Create GUI app (no console)
 # -DUNICODE -D_UNICODE: Use Wide Character API
 CFLAGS = -Wall -O2 -I$(INCLUDE_DIR) -I$(LOCAL_INCLUDE_DIR) -D_WIN32 -DUNICODE -D_UNICODE -fexec-charset=UTF-8
-LDFLAGS = -L$(LIB_DIR) -liup -lgdi32 -lcomdlg32 -lcomctl32 -luuid -lole32 -ladvapi32 -mwindows
+LDFLAGS = -L$(LIB_DIR) -liup -liupcd -lgdi32 -lcomdlg32 -lcomctl32 -luuid -lole32 -ladvapi32 -mwindows
 
 # Source
 SRC = src/main.c src/utils.c src/registry.c src/callbacks.c

src/main.c

@@ -39,10 +39,13 @@ int main(int argc, char **argv)
     list_path = IupFlatList();
     IupSetAttribute(list_path, "EXPAND", "YES");
     IupSetAttribute(list_path, "HLINE", "YES");
-    IupSetAttribute(list_path, "HLINECOLOR", "200 200 200");
+    IupSetAttribute(list_path, "HLINECOLOR", "100 100 100"); // 灰色
     IupSetAttribute(list_path, "ITEMPADDING", "5x5");
+    IupSetAttribute(list_path, "BACKCOLOR", "255 255 255");
+    IupSetAttribute(list_path, "BORDER", "YES");
+    IupSetAttribute(list_path, "CANFOCUS", "YES");
     // IupFlatList 不支持 VISIBLELINES，高度由 EXPAND 和布局决定
-    
+
     // 创建右侧按钮
     btn_new = IupButton("新建(N)", NULL);
     btn_edit = IupButton("编辑(E)", NULL);