fix: remove undici dependency and clean up ProxyManager code (#6020)

src/main/utils/index.ts

@@ -1,4 +1,5 @@
 import fs from 'node:fs'
+import fsAsync from 'node:fs/promises'
 import path from 'node:path'
 
 import { app } from 'electron'
@@ -52,3 +53,20 @@ export function makeSureDirExists(dir: string) {
     fs.mkdirSync(dir, { recursive: true })
   }
 }
+
+export async function calculateDirectorySize(directoryPath: string): Promise<number> {
+  let totalSize = 0
+  const items = await fsAsync.readdir(directoryPath)
+
+  for (const item of items) {
+    const itemPath = path.join(directoryPath, item)
+    const stats = await fsAsync.stat(itemPath)
+
+    if (stats.isFile()) {
+      totalSize += stats.size
+    } else if (stats.isDirectory()) {
+      totalSize += await calculateDirectorySize(itemPath)
+    }
+  }
+  return totalSize
+}