Upgrade Style Guide to Svelte v5

[wilwade]

Blocked by:

• a new release of https://github.com/storybookjs/addon-svelte-csf/

Looks like everything else has updates ready.

Guide: https://svelte.dev/docs/svelte/v5-migration-guide

[enddynayn]

It looks like we are currently unable to upgrade to Svelte 5 because of some version compatibility issues. The main blocker is @storybook/addon-svelte-csf, which isn’t fully ready to support Svelte 5 yet. Also, It looks like some dependencies (like vite and @sveltejs/vite-plugin-svelte) also need specific versions to play nice with Storybook.

I think we should wait until Storybook addon-svelte-csf catches up with Svelte 5.