[Bug]: Svelte v5.17.0 breaks args/Controls reactivity

[JReinhold]

Describe the bug

After upgrading Svelte to v5.17.0, changing args in the Controls panel have no effect on the story. Clicking the force re-mount button will correctly show with the changed args, but that shouldn't be necessary.

Reproduction link

Happens in any minimal Svelte+Vite sandbox, any story.

Still trying to minimal reproduce this in a non-Storybook context, but haven't been successful yet.

Reproduction steps

1. Have Svelte version ^5.17.0
2. Navigate to a story
3. Change some arg in the Controls panel
4. See that it doesn't affect the rendered story
5. Downgrade to Svelte version 5.16.6 and restart Storybook
6. See it correctly work

Additional context

• Using the $inspect(someProp) rune (or even $effect(...)) in the rendered component does trigger outputs to the console, so prop changes are propagated to the component, but for some reason those changes don't affect the DOM
• The most likely culprint is chore: improve signal performance by reducing duplicate deps sveltejs/svelte#14945, as the other changes in the version don't appear to touch anything related (at least based on the change titles)
• This happens in regular CSF too, so seems unrelated to the Svelte CSF addon

[JReinhold]

Fixed by sveltejs/svelte#14964, released in Svelte 5.17.3