Add the 3 missing widget components that were registered but not implemented:
- MukkeLibraryWidget: shows library stats (songs, playlists, favorites),
recent songs with artist/duration
- PresiDecksWidget: shows recent presentations with public/private
indicator, descriptions, and update dates
- ContextDocsWidget: shows recent documents grouped by type (text,
context, prompt) with space names, falls back to space list
All widgets follow the established pattern: APP_URLS for links,
WidgetSkeleton/WidgetError for loading/error, auto-retry on failure.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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