chore: clean up all migration/refactor documentation and stale comments
Removes all obsolete migration tracking docs and simplifies component
header comments now that the refactor is complete.
Documentation deleted:
- MIGRATION_TRACKER.md (276 lines)
- REFACTOR_PROGRESS.md (324 lines)
- REFACTOR_NOTES.md (147 lines)
- REMAINING_WORK.md (348 lines)
- DESIGN_IMPROVEMENTS.md (143 lines)
- App.refactored.tsx (old intermediate file)
Source code cleanup:
- YouView.tsx: Simplified header from 38 lines to 15 lines
- SettingsView.tsx: Simplified header from 35 lines to 7 lines
- KnowledgeView.tsx: Simplified header from 71 lines to 10 lines
- AppHeader.tsx: Simplified header from 29 lines to 11 lines
- AppSidebar.tsx: Simplified header from 43 lines to 13 lines
- BottomNavigation.tsx: Simplified header from 39 lines to 12 lines
All comments now focus on what the component does, not migration status
or which old file it replaced. Git history preserves all that context.
Total cleanup: ~1,500 lines of obsolete documentation removed.