feat(reads): Phase 2 — editor, drafts, publish, highlights
- Create DraftLongTextNoteEvent (kind 30024) in quartz with EventFactory registration
- Create LongFormPublishAction for signing + publishing kind 30023 events
- Create split-pane ArticleEditorScreen with live markdown preview
- Create MarkdownToolbar (bold, italic, heading, link, image, code, quote)
- Create MetadataPanel (title, summary, banner, tags, slug)
- Create DesktopDraftStore with JSON index + .md files, atomic writes, slug sanitization
- Create DraftsScreen with draft list, delete, new draft button
- Create HighlightCreator dialog for kind 9802 highlight creation
- Add Drafts nav rail entry and Editor/Drafts screen routing
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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