feat(tui): add initial support for workspaces into the tui (#16230)

packages/opencode/src/cli/cmd/tui/thread.ts

@@ -42,6 +42,9 @@ function createWorkerFetch(client: RpcClient): typeof fetch {
 function createEventSource(client: RpcClient): EventSource {
   return {
     on: (handler) => client.on<Event>("event", handler),
+    setWorkspace: (workspaceID) => {
+      void client.call("setWorkspace", { workspaceID })
+    },
   }
 }