fix: normalize scss variable injection on Windows

- normalize injected variables.scss path for Windows Sass
- skip variable-defining scss files to avoid duplicate global variables

vite.config.ts

@@ -20,6 +20,7 @@ export default ({command, mode}: ConfigEnv): UserConfig => {
     } else {
         env = loadEnv(mode, root)
     }
+    const variablesScssPath = normalizePath(pathResolve('src/styles/variables.scss'))
     return {
         base: env.VITE_BASE_PATH,
         root: root,
@@ -47,7 +48,18 @@ export default ({command, mode}: ConfigEnv): UserConfig => {
             },
             preprocessorOptions: {
                 scss: {
-                    additionalData: `@use "${normalizePath(pathResolve('src/styles/variables.scss'))}" as *;`,
+                    additionalData: (source: string, filename: string) => {
+                        const normalizedFilename = normalizePath(filename)
+                        // Windows 下更容易触发重复注入：定义或显式转导变量的文件，不能再次注入同一个
+                        // `@use ... as *`，否则 Sass 会报 duplicate global variables。
+                        if (
+                            normalizedFilename.endsWith('/src/styles/variables.scss') ||
+                            normalizedFilename.endsWith('/src/styles/global.module.scss')
+                        ) {
+                            return source
+                        }
+                        return `@use "${variablesScssPath}" as *;\n${source}`
+                    },
                     api: 'modern-compiler'
                 }
             }