Leho optimize cxl-app-layout stories, fix #269

[lkraav]

@paulkirspuu you can rebase your branch on this already.

[github-actions[bot]]

size-limit report 📦

Path	Size
packages/cxl-ui/pkg/dist-web/cxl-ui.js	33.69 KB (+0.37% 🔺)
packages/cxl-ui/pkg/dist-web/cxl-ui-jwplayer.js	11.87 KB (0%)
packages/cxl-ui/pkg/dist-web/cxl-ui-playbooks.js	24.9 KB (0%)
packages/cxl-ui/pkg/dist-web/vendor.js	125.63 KB (+0.03% 🔺)
packages/cxl-ui/pkg/dist-web/cxl-ui-jwplayer.js, packages/cxl-ui/pkg/dist-web/cxl-ui-playbooks.js, packages/cxl-ui/pkg/dist-web/cxl-ui.js, packages/cxl-ui/pkg/dist-web/manifest.js, packages/cxl-ui/pkg/dist-web/unresolved.js, packages/cxl-ui/pkg/dist-web/vendor.js	197.25 KB (+0.08% 🔺)

[lkraav]

OK rebase, and use the new partial now @paulkirspuu.

[lkraav]

Significant story architecture upgrade, this is SB7-ready now. Rebase again.