Refactor PublishSpellbookAction from class-based to async generator pattern
following official applesauce-actions patterns. This provides better integration
with ActionHub and enables proper reactive event publishing.
Changes:
- Add publishEvent function to ActionHub with relay selection fallback strategy
(outbox relays → seen relays → error)
- Convert PublishSpellbookAction to PublishSpellbook async generator
- Update SaveSpellbookDialog and SpellbooksViewer to use hub.run()
- Add comprehensive test suite (14 tests covering validation, event creation,
slug generation, factory integration, and workspace selection)
- Improve error handling with specific error messages
- Add JSDoc documentation with usage examples
All tests passing ✅ (14/14)
TypeScript compilation successful ✅🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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