Function cleanup

packages/cli/src/commands/preview.ts:947–953

()

      // Kill ffmpeg first (sync, fast), then drain browsers (async, slower).
      const cleanup = async () => {
        const { closeThumbnailBrowser } = await import("../server/studioServer.js");
        const { drainBrowserPool, killTrackedProcesses } = await import("@hyperframes/engine");
        killTrackedProcesses();
        await closeThumbnailBrowser().catch(() => {});
        await drainBrowserPool().catch(() => {});
      };

      cleanup()
        .catch(() => {})