fix: remove QR code from OAuth authentication UI to prevent screen flickering

Remove the terminal QR code display from the OAuth authentication progress
component. The QR code caused severe screen flickering on Windows PowerShell
due to Ink's full re-render cycle combined with the large character volume
of the QR code and high-frequency state updates (spinner + countdown timer).

The authorization URL link is preserved for users to complete authentication.

Changes:
- Remove qrcode-terminal import and QrCodeDisplay component
- Replace with simplified AuthUrlDisplay component (URL only)
- Remove qrCodeData state and QR code generation useEffect
- Remove unused createDebugLogger import and debugLogger instance

packages/cli/src/ui/components/QwenOAuthProgress.tsx

@@ -9,10 +9,8 @@ import { useState, useEffect, useMemo } from 'react';
 import { Box, Text } from 'ink';
 import Spinner from 'ink-spinner';
 import Link from 'ink-link';
-import qrcode from 'qrcode-terminal';
 import { Colors } from '../colors.js';
 import type { DeviceAuthorizationData } from '@qwen-code/qwen-code-core';
-import { createDebugLogger } from '@qwen-code/qwen-code-core';
 import { useKeypress } from '../hooks/useKeypress.js';
 import { t } from '../../i18n/index.js';
 
@@ -30,23 +28,15 @@ interface QwenOAuthProgressProps {
   authMessage?: string | null;
 }
 
-const debugLogger = createDebugLogger('QWEN_OAUTH_PROGRESS');
-
 /**
- * Static QR Code Display Component
- * Renders the QR code and URL once and doesn't re-render unless the URL changes
+ * Static Auth URL Display Component
+ * Renders the authorization URL once and doesn't re-render unless the URL changes
  */
-function QrCodeDisplay({
+function AuthUrlDisplay({
   verificationUrl,
-  qrCodeData,
 }: {
   verificationUrl: string;
-  qrCodeData: string | null;
-}): React.JSX.Element | null {
-  if (!qrCodeData) {
-    return null;
-  }
-
+}): React.JSX.Element {
   return (
     <Box
       borderStyle="round"
@@ -68,14 +58,6 @@ function QrCodeDisplay({
           {verificationUrl}
         </Text>
       </Link>
-
-      <Box marginTop={1}>
-        <Text>{t('Or scan the QR code below:')}</Text>
-      </Box>
-
-      <Box marginTop={1}>
-        <Text>{qrCodeData}</Text>
-      </Box>
     </Box>
   );
 }
@@ -134,7 +116,6 @@ export function QwenOAuthProgress({
   const defaultTimeout = deviceAuth?.expires_in || 300; // Default 5 minutes
   const [timeRemaining, setTimeRemaining] = useState<number>(defaultTimeout);
   const [dots, setDots] = useState<string>('');
-  const [qrCodeData, setQrCodeData] = useState<string | null>(null);
 
   useKeypress(
     (key) => {
@@ -148,30 +129,6 @@ export function QwenOAuthProgress({
     { isActive: true },
   );
 
-  // Generate QR code once when device auth is available
-  useEffect(() => {
-    if (!deviceAuth?.verification_uri_complete) {
-      return;
-    }
-
-    const generateQR = () => {
-      try {
-        qrcode.generate(
-          deviceAuth.verification_uri_complete,
-          { small: true },
-          (qrcode: string) => {
-            setQrCodeData(qrcode);
-          },
-        );
-      } catch (error) {
-        debugLogger.error('Failed to generate QR code:', error);
-        setQrCodeData(null);
-      }
-    };
-
-    generateQR();
-  }, [deviceAuth?.verification_uri_complete]);
-
   // Countdown timer
   useEffect(() => {
     const timer = setInterval(() => {
@@ -199,17 +156,14 @@ export function QwenOAuthProgress({
     return () => clearInterval(dotsTimer);
   }, []);
 
-  // Memoize the QR code display to prevent unnecessary re-renders
-  const qrCodeDisplay = useMemo(() => {
+  // Memoize the auth URL display to prevent unnecessary re-renders
+  const authUrlDisplay = useMemo(() => {
     if (!deviceAuth?.verification_uri_complete) return null;
 
     return (
-      <QrCodeDisplay
-        verificationUrl={deviceAuth.verification_uri_complete}
-        qrCodeData={qrCodeData}
-      />
+      <AuthUrlDisplay verificationUrl={deviceAuth.verification_uri_complete} />
     );
-  }, [deviceAuth?.verification_uri_complete, qrCodeData]);
+  }, [deviceAuth?.verification_uri_complete]);
 
   // Handle timeout state
   if (authStatus === 'timeout') {
@@ -306,8 +260,8 @@ export function QwenOAuthProgress({
 
   return (
     <Box flexDirection="column" width="100%">
-      {/* Static QR Code Display */}
-      {qrCodeDisplay}
+      {/* Static Auth URL Display */}
+      {authUrlDisplay}
 
       {/* Dynamic Status Display */}
       <StatusDisplay timeRemaining={timeRemaining} dots={dots} />