Fix file retention after updates on macOS #417

This fixes issue #417 where autoupdate installer files were not deleted
on macOS, leading to accumulation of old installers.

Key changes:

- Store update files in application-specific directory
- Clear update files directory on every app launch

Other supporting changes:

- Refactor file system operations to be more testable and reusable
- Improve separation of concerns in directory management
- Enhance dependency injection for auto-update logic
- Fix async completion to support `await` operations
- Add additional logging and revise some log messages during updates

src/presentation/electron/main/Update/ManualUpdater/Integrity.ts

@@ -1,7 +1,7 @@
 import { createHash } from 'node:crypto';
 import { createReadStream } from 'node:fs';
 import { ElectronLogger } from '@/infrastructure/Log/ElectronLogger';
-import { retryFileSystemAccess } from './RetryFileSystemAccess';
+import { retryFileSystemAccess } from './FileSystemAccessorWithRetry';
 
 export async function checkIntegrity(
   filePath: string,