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

tests/unit/infrastructure/Dialog/Electron/NodeElectronSaveFileDialog.spec.ts

@@ -7,7 +7,7 @@ import type { Logger } from '@/application/Common/Log/Logger';
 import { LoggerStub } from '@tests/unit/shared/Stubs/LoggerStub';
 import { expectExists } from '@tests/shared/Assertions/ExpectExists';
 import { ReadbackFileWriterStub } from '@tests/unit/shared/Stubs/ReadbackFileWriterStub';
-import { FileReadbackVerificationErrors, FileWriteOperationErrors, type ReadbackFileWriter } from '@/infrastructure/ReadbackFileWriter/ReadbackFileWriter';
+import { FileReadbackVerificationErrors, FileWriteOperationErrors, type ReadbackFileWriter } from '@/infrastructure/FileSystem/ReadbackFileWriter/ReadbackFileWriter';
 import { ElectronFileDialogOperationsStub } from './ElectronFileDialogOperationsStub';
 import { NodePathOperationsStub } from './NodePathOperationsStub';