fix: use original-fs to bypass Electron asar interception

src/main/index.ts

@@ -1,6 +1,7 @@
 import { app, BrowserWindow, Menu, clipboard, ipcMain, safeStorage, session, shell } from 'electron';
 import { join, dirname } from 'path';
-import { existsSync, mkdirSync, unlinkSync, promises as fsp } from 'fs';
+import { existsSync, mkdirSync, promises as fsp } from 'fs';
+import { existsSync as origExistsSync, unlinkSync as origUnlinkSync } from 'original-fs';
 import { get as httpsGet } from 'https';
 import { execFile } from 'child_process';
 import * as os from 'os';
@@ -179,8 +180,8 @@ app.whenReady().then(async () => {
     // Clean up stale pending asar from a previous failed swap
     const resourcesDir = join(dirname(app.getPath('exe')), 'resources');
     const stalePending = join(resourcesDir, 'app-pending.asar');
-    if (existsSync(stalePending)) {
-      try { unlinkSync(stalePending); } catch { /* ignore */ }
+    if (origExistsSync(stalePending)) {
+      try { origUnlinkSync(stalePending); } catch { /* ignore */ }
     }
 
     try {
@@ -213,8 +214,8 @@ app.whenReady().then(async () => {
           } catch (err) {
             electronLog.error('[KCC] Patch download failed:', err);
             // Clean up failed download
-            if (existsSync(pendingPath)) {
-              try { unlinkSync(pendingPath); } catch { /* ignore */ }
+            if (origExistsSync(pendingPath)) {
+              try { origUnlinkSync(pendingPath); } catch { /* ignore */ }
             }
             if (!updateWin.isDestroyed()) updateWin.close();
           }