[SPRINT-3] feat: Add WCAG improvements and 160 unit tests
## ST-3.1 WCAG Accessibility (5 SP)
- Replace div onClick with semantic buttons
- Add aria-label to interactive icons
- Add aria-hidden to decorative icons
- Add focus:ring-2 for visible focus states
- Add role attributes to modals, trees, progressbars
- Add proper form labels with htmlFor
Files modified: NotificationDrawer, DashboardLayout, PermissionsMatrix,
NetworkTree, GoalProgressBar, AuditFilters, NotificationBell,
NotificationItem, RoleCard, RoleForm
## ST-3.2 Unit Tests (5 SP)
- Add 160 new unit tests (target was 42)
- Hooks: useAuth (18), useRbac (18), useGoals (15), useMlm (19), usePortfolio (24)
- Components: RoleForm (15), GoalProgressBar (28), RankBadge (23)
- All tests use AAA pattern with proper mocking
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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