Update dependency svelte to v5.8.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
svelte (source)	5.6.2 -> 5.8.1

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Release Notes

sveltejs/svelte (svelte)

v5.8.1

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Patch Changes

• fix: reinstate missing prefersReducedMotion export (#​14586)

v5.8.0

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Minor Changes

• feat: add Spring and Tween classes to svelte/motion (#​11519)

v5.7.1

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Patch Changes

• fix: ensure bindings always take precedence over spreads (#​14575)

v5.7.0

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Minor Changes

• feat: add createSubscriber function for creating reactive values that depend on subscriptions (#​14422)

• feat: add reactive MediaQuery class, and a prefersReducedMotion class instance (#​14422)

Patch Changes

• fix: treat undefined and null the same for the initial input value (#​14562)

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