fix(app): use current default model (#38603)

packages/session-ui/src/context/data.tsx

@@ -5,6 +5,10 @@ import { PreloadMultiFileDiffResult } from "@pierre/diffs/ssr"
 
 export type NormalizedProviderListResponse = {
   all: Map<string, Provider>
+  defaultModel?: {
+    providerID: string
+    modelID: string
+  } | null
   default: {
     [key: string]: string
   }