test: sync app chat model override expectation

ui/src/ui/app-chat.test.ts

@@ -149,8 +149,8 @@ describe("handleSendChat", () => {
       model: "gpt-5-mini",
     });
     expect(host.chatModelOverrides.main).toEqual({
-      kind: "raw",
-      value: "gpt-5-mini",
+      kind: "qualified",
+      value: "openai/gpt-5-mini",
     });
   });
 });