FIX: AutoUpdaterService code style improvements

src/main/services/AutoUpdaterService.ts

@@ -1,12 +1,11 @@
-import { autoUpdater } from 'electron-updater';
 import { dialog, shell, type BrowserWindow } from 'electron';
 import { log } from '@shared/utils/logger';
 import { getVersion } from '@shared/utils/version';
 
 export class AutoUpdaterService {
   private mainWindow: BrowserWindow | null = null;
-  private updateCheckInProgress = false;
-  private updateDownloaded = false;
+  private readonly updateCheckInProgress = false;
+  private readonly updateDownloaded = false;
   private readonly repoOwner = 'miwi-fbsd';
   private readonly repoName = 'CCTracker';
   private lastManualCheckTime = 0;
@@ -46,9 +45,9 @@
   /**
    * Download and install update (disabled - manual only)
    */
-  async downloadAndInstallUpdate(): Promise<void> {
+  downloadAndInstallUpdate(): Promise<void> {
     log.info('Auto-download disabled - please use manual update check', 'AutoUpdater');
-    throw new Error('Automatic downloads disabled. Please use manual update check.');
+    return Promise.reject(new Error('Automatic downloads disabled. Please use manual update check.'));
   }
 
   /**
@@ -104,7 +103,7 @@
       log.info('Checking for updates manually via GitHub API', 'AutoUpdater');
       const latestRelease = await this.fetchLatestRelease();
 
       if (!latestRelease) {
         log.info('No release information available', 'AutoUpdater');
         return false;
       }
@@ -133,7 +132,7 @@
   /**
    * Fetch latest release from GitHub API
    */
   private async fetchLatestRelease(): Promise<any> {
     const url = `https://api.github.com/repos/${this.repoOwner}/${this.repoName}/releases/latest`;
 
     try {
@@ -171,7 +170,7 @@
   /**
    * Show manual update dialog when update is available
    */
   private async showManualUpdateDialog(release: any): Promise<void> {
     if (!this.mainWindow || this.mainWindow.isDestroyed()) {
       return;
     }