## 1. Multi-turn History

- [x] 1.1 Change ChatRequest construction in Chat.razor to send all prior messages (excluding the empty assistant placeholder) instead of just the latest user message

## 2. New Chat Button

- [x] 2.1 Add a "New Chat" icon button to the AppBar or chat page that clears _messages
- [x] 2.2 Disable the "New Chat" button while streaming is in progress

## 3. Verify

- [x] 3.1 Run dotnet build to confirm no errors
- [x] 3.2 Run dotnet test to confirm existing tests still pass