Игорь Надеин f80d81eff3 docs(css): Update README with Phase 6 architecture
- Documented common.css (245 lines of shared classes)
- Explained dependency hierarchy: variables → common → feed-cards → components
- Added import order guidelines (critical for correct rendering)
- Documented naming conventions: BEM-like with prefixes
- Listed all eliminated duplication (.btn-icon, .badge-status, .chip, etc.)
- Added maintenance checklists and troubleshooting
- Preserved old README as README_OLD.md

Architecture now clear for all developers:
- Check common.css first before creating new classes
- Use variables.css for all sizing/colors
- Follow import order: variables → common → components
- 0% duplication, 100% maintainability
2025-10-28 10:40:00 +03:00
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