fix(exports): add default export conditions for svelte packages

[techniq]

Summary

• Add default export conditions to the svelte-actions, svelte-state, svelte-stores, and svelte-table package manifests.
• Update the affected package export maps to support default resolution.

Why

• Ensures these packages expose a default export path for consumers relying on standard package resolution.
• Aligns the package metadata across the Svelte package set.

Testing

• Not documented in the changed files.

[changeset-bot]

🦋 Changeset detected

Latest commit: 87dbbb4

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 5 packages

Name	Type
@layerstack/svelte-actions	Patch
@layerstack/svelte-state	Patch
@layerstack/svelte-stores	Patch
@layerstack/svelte-table	Patch
@layerstack/docs-site	Patch

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commit: 87dbbb4

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