Add unit tests for CLI modules and fix ESLint issues

- Add comprehensive unit tests for all CLI-related modules:
  - CliContextManager
  - CliVersionManager
  - cliDetector
  - CliInstaller
- Fix ESLint issues by replacing @ts-ignore with @ts-expect-error
- Fix any type issues in test files
- Add tests for diff-manager functionality
- Improve loading messages random selection stability

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

packages/vscode-ide-companion/src/webview/handlers/EditorMessageHandler.ts

@@ -6,7 +6,7 @@
 
 import * as vscode from 'vscode';
 import { BaseMessageHandler } from './BaseMessageHandler.js';
-import { getFileName } from '../../utils/webviewUtils.js';
+import { getFileName } from '../utils/webviewUtils.js';
 
 /**
  * Editor message handler