docs: mark workspace-visual-overhaul tasks as complete
All 7 phases complete:
- Phase 1: Workspace header with project icon, name, History/Settings buttons
- Phase 2: Project settings page with tabbed layout (General, Repositories, Members)
- Phase 3: Repository management moved to settings tab
- Phase 4: Sidebar cleaned (repo selector, branch selector, file tree)
- Phase 5: Members placeholder tab added
- Phase 6: Breadcrumbs, mobile responsiveness, transitions
- Phase 7: Quality gates passed (typecheck, lint, build)
Fusion
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