Migration: Svelte 5

[BeeMargarida]

Description

Migrating svelteui to svelte5.

• All components now using runes
  • Regression check
• All composables using runes
  • Regression check
• Update demos
• Update docs usage of components
• Update unit tests (see if we can postpone composables as well)
• Migrate storybook (postponed to after the release)
• Update docs with changes to components API

Before submitting the PR, please make sure you do the following

• Read the Contributing guide
• Prefix your PR title with [@svelteui/core], [@svelteui/actions], [@svelteui/motion], [@svelteui/core], [core], or [docs].
• Include a description of the changes made in the PR description and in the commit messages.
• Include screenshots/videos of the changes made.
• Verify that the linter and tests are passing, with yarn lint and yarn test or just run yarn prepush.