Close clearApiMonitor

The merge that brought main into this branch dropped the closing brace, so the
function body ran straight into the interface declared below it and the frontend
did not compile at all: tsc reports TS1005 at the end of the file and vite fails
the build. Reproduced against the pushed head and clean with the brace restored.

studio/frontend/src/features/chat/api/chat-api.ts

@@ -134,6 +134,8 @@ export async function clearApiMonitor(): Promise<void> {
     method: "DELETE",
   });
   await parseJsonOrThrow<{ cleared: boolean }>(response);
+}
+
 export interface ActiveGenerationsResponse {
   count: number;
   /** Conversations with a generation in flight. Shorter than `count` when a