[upstream #16609] Minimal resume submission breaks the error card when a reattached stream fails #223

Found while testing resumeStream for LibreChat-AI#16609.

When the stream status route answers a running job without resumeState, useResumeOnLoad builds a minimal resume submission whose initialResponse is { messageId: 'resume_', conversationId, text: '', content } with no isCreatedByUser (client/src/hooks/SSE/useResumeOnLoad.ts, the else branch that sets resumeStreamId). If the reattached stream then delivers a server-written error event, errorHandler builds the error turn from that initialResponse and tMessageSchema.parse throws a ZodError (isCreatedByUser required) in parseErrorResponse (client/src/hooks/SSE/useEventHandlers.ts). The error card is never written and the pane stays submitted.

Reproduce: in client/src/hooks/Chat/__tests__/transport.spec.tsx (resume block), answer the status read with { active: true, streamId, status: 'running', createdAt } and no resumeState, call resumeStream(), then emit { type: 'error', data: { message: 'x' } } on the reattached stream.

Current servers send resumeState for running jobs, so this needs an older server or a status without it. Fix: give the minimal initialResponse isCreatedByUser: false (and a parent), and cover the error path in that spec.