refactor(src/styles): reformat constant definitions

Adjust @define statements to proper syntax and remove outdated comment markers, improving readability and consistency.

src/styles/constant.css

@@ -21,11 +21,11 @@
 
 /* Constants */
 /* :vars replaced by defines */
-    @define radius-xs 4px;
-    @define radius-sm 8px;
-    @define radius-md 12px;
-    @define radius-lg 16px;
-    @define radius-xl 20px;
-    @define radius-full 999px;
-    @define transition-fast 0.15s;
-    @define transition-slow 0.3s;
+@define radius-xs 4px;
+@define radius-sm 8px;
+@define radius-md 12px;
+@define radius-lg 16px;
+@define radius-xl 20px;
+@define radius-full 999px;
+@define transition-fast 0.15s;
+@define transition-slow 0.3s;