Introduces createAutoSaveStore() using $state() for automatic reactivity.
New store provides cleaner API while maintaining backward compatibility.
Changes:
- New: src/lib/admin/autoSave.svelte.ts with createAutoSaveStore()
- Uses $state() for status and lastError (reactive getters)
- Export AutoSaveStore and AutoSaveStoreOptions types
- Add JSDoc with usage examples
- Update autoSaveLifecycle.ts to accept both old and new types
- Export AutoSaveController type from old file for compatibility
Old createAutoSaveController() remains unchanged for gradual migration.
Type checking passes with no new errors.
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Co-Authored-By: Claude <noreply@anthropic.com>
