- Move ProgressMonitor into dedicated folder with sub-components
- Extract ProgressStats, ProgressSection, ColorBlockList, ColorBlockItem, ProgressActions
- Create threadMetadata utility for formatting thread metadata
- Reduce ProgressMonitor.tsx from 389 to 178 lines (54% reduction)
Part of #33: Extract sub-components from large components
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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>