feat: integrate pixel teacher presence and resilient classroom preview

electron/coding-runtime/pi/provider-failure.ts

@@ -3,10 +3,11 @@ import { isAIGatewayUserContextMissing } from '../../../shared/ai-gateway-error-
 import { getAIGatewayErrorKind } from '../../../shared/ai-gateway-error-kind';
 
 export function projectPiProviderFailure(message: unknown): CodingRuntimePublicError {
-  if (typeof message === 'string' && isAIGatewayUserContextMissing(message)) {
+  if (typeof message === 'string' && (isAIGatewayUserContextMissing(message)
+    || message.toLowerCase().includes('works square login session is missing or expired'))) {
     return {
       code: 'CODING_PROVIDER_AUTH_REQUIRED',
-      message: '模型服务身份上下文无效，请重试；若仍失败请重新登录。',
+      message: '登录已失效，请重新登录后继续。',
       recoverable: true,
     };
   }