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/utils/webviewUtils.ts

@@ -0,0 +1,31 @@
+/**
+ * @license
+ * Copyright 2025 Qwen Team
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/**
+ * Extract filename from full path
+ * @param fsPath Full path of the file
+ * @returns Filename (without path)
+ */
+export function getFileName(fsPath: string): string {
+  // Use path.basename logic: find the part after the last path separator
+  const lastSlash = Math.max(fsPath.lastIndexOf('/'), fsPath.lastIndexOf('\\'));
+  return lastSlash >= 0 ? fsPath.substring(lastSlash + 1) : fsPath;
+}
+
+/**
+ * HTML escape function to prevent XSS attacks
+ * Convert special characters to HTML entities
+ * @param text Text to escape
+ * @returns Escaped text
+ */
+export function escapeHtml(text: string): string {
+  return text
+    .replace(/&/g, '&')
+    .replace(/</g, '&lt;')
+    .replace(/>/g, '&gt;')
+    .replace(/"/g, '&quot;')
+    .replace(/'/g, '&#039;');
+}