chore: bump svelte to 5.50

[jycouet]

Since sveltejs/svelte#17319 ecosystem-ci is failing

It's because of the new formating. Not sure what's the best... tweak add fragment like I did here? Or change something in svelte? @manuel3108 ?

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commit: de62370

[jycouet]

I'm moving this into draft with last convo we had with @manuel3108
"We" (he :D) is looking into Svelte