AGUI not streaming in Microsoft Edge browser (Mac & Windows)

I am testing AGUI with the Microsoft Agent Framework and have observed that responses are not streaming as expected. Instead, the system waits until the final message is received before displaying the entire response in a single event. I anticipated seeing message chunks delivered via Server-Sent Events (SSE) streaming, but this functionality is not operating correctly. I have tested all AGUI Dojo examples that utilize streaming, as well as CopilotKit and my custom integration with react and typescript, yet the issue persists.

Interestingly, responses stream successfully when testing in Safari or Chrome; I wonder why this limitation exists only with Microsoft Edge.

It's worth noting that the issue isn't with `CopilotKit`; my custom implementation runs into the same problems. This suggests the root cause lies in the core libraries—either @ag-ui/client or @ag-ui/core.

You can repro this issue yourself via [DOJO examples](https://dojo.ag-ui.com/microsoft-agent-framework-dotnet/feature/agentic_chat).