Remove network calls from demo app

Describe the bug

I have seen so many people complaining that SvelteKit is slow. No one realizes that a locally created demo app would be making network calls.

E.g. https://discord.com/channels/457912077277855764/939868205869072444/950313663850508328

This would also solve our issues around eventual consistency: https://github.com/sveltejs/kit/issues/1564

Reproduction

I don’t know if these people have particularly slow network connections or the app or host is sometimes being quite slow

Logs

No response

System Info

N/A

Severity

annoyance

Additional Information

No response

[Conduitry]

Even without the speed concerns, I’d be in favor of a tiny ad-hoc in-memory data store thing for the todo app rather than calling out to the Cloudflare KV API.

[alexiglesias93]

If the confusion is around the loading speed difference between static pages and the TODOs page, perhaps a simpler solution would be to just add some Loading states in the UI that explicitly show that the app is performing some requests in the background?

• Show a Preloading Indicator when navigating through pages.
• Show a loading spinner when creating/updating/deleting a TODO.