feat(extensions): add detail command and improve extension validation

- Add /extensions detail command to show extension details
- Allow underscores and dots in extension names
- Fix contextFileName empty array handling to use default QWEN.md
- Fix marketplace extension clone to use correct source URL
- Add inline parameter to extensionToOutputString
- Add comprehensive tests for all changes

packages/cli/src/commands/extensions/utils.test.ts

@@ -5,7 +5,8 @@
  */
 
 import { describe, it, expect, vi, beforeEach } from 'vitest';
-import { getExtensionManager } from './utils.js';
+import { getExtensionManager, extensionToOutputString } from './utils.js';
+import type { Extension, ExtensionManager } from '@qwen-code/qwen-code-core';
 
 const mockRefreshCache = vi.fn();
 const mockExtensionManagerInstance = {
@@ -64,3 +65,70 @@ describe('getExtensionManager', () => {
     );
   });
 });
+
+describe('extensionToOutputString', () => {
+  const mockIsEnabled = vi.fn();
+  const mockExtensionManager = {
+    isEnabled: mockIsEnabled,
+  } as unknown as ExtensionManager;
+
+  const createMockExtension = (overrides = {}): Extension => ({
+    id: 'test-ext-id',
+    name: 'test-extension',
+    version: '1.0.0',
+    isActive: true,
+    path: '/path/to/extension',
+    contextFiles: [],
+    config: { name: 'test-extension', version: '1.0.0' },
+    ...overrides,
+  });
+
+  beforeEach(() => {
+    vi.clearAllMocks();
+    mockIsEnabled.mockReturnValue(true);
+  });
+
+  it('should include status icon when inline is false', () => {
+    const extension = createMockExtension();
+    const result = extensionToOutputString(
+      extension,
+      mockExtensionManager,
+      '/workspace',
+      false,
+    );
+
+    // Should contain either ✓ or ✗ (with ANSI color codes)
+    expect(result).toMatch(/test-extension/);
+    expect(result).toContain('(1.0.0)');
+  });
+
+  it('should exclude status icon when inline is true', () => {
+    const extension = createMockExtension();
+    const result = extensionToOutputString(
+      extension,
+      mockExtensionManager,
+      '/workspace',
+      true,
+    );
+
+    // Should start with extension name (after stripping potential whitespace)
+    expect(result.trim()).toMatch(/^test-extension/);
+  });
+
+  it('should default inline to false', () => {
+    const extension = createMockExtension();
+    const resultWithoutInline = extensionToOutputString(
+      extension,
+      mockExtensionManager,
+      '/workspace',
+    );
+    const resultWithInlineFalse = extensionToOutputString(
+      extension,
+      mockExtensionManager,
+      '/workspace',
+      false,
+    );
+
+    expect(resultWithoutInline).toEqual(resultWithInlineFalse);
+  });
+});

packages/cli/src/commands/extensions/utils.ts

@@ -32,6 +32,7 @@ export function extensionToOutputString(
   extension: Extension,
   extensionManager: ExtensionManager,
   workspaceDir: string,
+  inline = false,
 ): string {
   const cwd = workspaceDir;
   const userEnabled = extensionManager.isEnabled(
@@ -44,7 +45,7 @@ export function extensionToOutputString(
   );
 
   const status = workspaceEnabled ? chalk.green('✓') : chalk.red('✗');
-  let output = `${status} ${extension.config.name} (${extension.config.version})`;
+  let output = `${inline ? '' : status} ${extension.config.name} (${extension.config.version})`;
   output += `\n Path: ${extension.path}`;
   if (extension.installMetadata) {
     output += `\n Source: ${extension.installMetadata.source} (Type: ${extension.installMetadata.type})`;