Missing generated.yaml silently breaks the app — no feedback to user

[HishamHR5]

What's happening

If you skip the step of downloading generated.yaml,
the app just loads a blank/broken page with zero explanation. Took me a while to
figure out what was wrong! 😄

What I expected

Some kind of alert or banner saying "hey, looks like generated.yaml is missing —
here's how to fix it" with the setup command to run.

To reproduce

1. Clone the repo and run npm install
2. Skip the curl step for generated.yaml
3. Run ng serve → open http://localhost:4200/circular-heatmap
4. broken page 👀

I would love to take this on as one of my first contributions to get familiar with the codebase. Could a maintainer
assign this to me?