chore(deps): update dependency svelte to ^5.15.0 [skip ci]

This MR contains the following updates:

Package	Type	Update	Change
svelte (source)	devDependencies	minor	^5.14.6 -> ^5.15.0

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Release Notes

sveltejs/svelte (svelte)

v5.15.0

Compare Source

Minor Changes

• feat: add "worker" exports condition to better support bundling for worker-based environments (#​14779)

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