refactor(vscode-ide-companion): simplify ACP connection and cleanup configurations

- Remove .claude from .gitignore
- Update CSS file path in eslint config
- Simplify VS Code extension title
- Remove unused keybinding for openChat command
- Delete unused auth constants file
- Simplify ACP connection by removing backend parameter
- Move authMethod to acpTypes
- Restrict ACP backend to Qwen only
- Remove backend property from connection state
- Minor formatting update in webview index.tsx

packages/vscode-ide-companion/src/webview/WebViewProvider.ts

@@ -15,7 +15,7 @@ import { MessageHandler } from '../webview/MessageHandler.js';
 import { WebViewContent } from '../webview/WebViewContent.js';
 import { CliInstaller } from '../cli/cliInstaller.js';
 import { getFileName } from './utils/webviewUtils.js';
-import { authMethod } from '../constants/auth.js';
+import { authMethod } from '../types/acpTypes.js';
 
 export class WebViewProvider {
   private panelManager: PanelManager;

packages/vscode-ide-companion/src/webview/index.tsx

@@ -6,6 +6,7 @@
 
 import ReactDOM from 'react-dom/client';
 import { App } from './App.js';
+
 // eslint-disable-next-line import/no-internal-modules
 import './styles/tailwind.css';
 // eslint-disable-next-line import/no-internal-modules