fix: properly transform invalid identifiers

[paoloricciuti]

This fix the transform to handle the case where the template name is an invalid identifier.

Before it was using camelCase (only for the Story actually so that was also a bug) but the problem with camelCase is that it can lead to the same name from different string. For example Modal && Trigger and Modal || Trigger have the same camelCase.

To fix this i used a small hash function (stolen from the svelte code base) so that if the template is not a valid identifier (which needs to be to be a Snippet) it convert it to something like template_skajsh (which we don't care too much except for stack traces).

I don't know if it's a solution that you like but it works.

[xeho91]

🧡

Apologies for missing the case where the transformation of the legacy template component id needs to be a valid identifier for snippet. I know you mentioned it on Discord!

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BTW, Jeppe. We could implement some formatting CI to this repo (Prettier probably is the best choice since it supports Svelte, unlike Biome). I'm saying this because I've noticed formatting changes in this PR.