feat(reads): Phase 1 — article reader with markdown, ToC, reading time
- Add richtext-commonmark deps to commons for shared markdown rendering
- Create RenderMarkdown composable with URL scheme allowlist (security)
- Create ArticleMediaRenderer interface for platform-specific media
- Create ArticleHeader with banner, title, author, reading time metadata
- Create TableOfContents with heading extraction and scroll-spy
- Create ReadingTimeCalculator (238 WPM prose, 80 WPM code, image decay)
- Create ArticleReaderScreen with Medium-style typography (680dp, 1.58x)
- Add DesktopScreen.Article navigation with address tag routing
- Update ReadsScreen to navigate via address tags instead of event IDs
- Responsive ToC sidebar (shown when window > 1100dp)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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