US-003: Create DetailPanelContext, DetailPanel component, and useFocusTrap hook
Implements core detail panel infrastructure for slide-in content panels:
- DetailPanelContext: Manages panel state (content, open/close, isOpen)
- DetailPanel: Slide-in panel component with backdrop, header, and scrollable body
- useFocusTrap: Keyboard focus trap hook for modal accessibility
- Width mapping: narrow (400px) for kpi/skill/education, wide (60vw) for consultation/project/career-role
- Title mapping derives from content data (kpi.label, skill.name, etc.)
- Close triggers: backdrop click, Escape key, X button
- ARIA: aria-modal, role=dialog, aria-labelledby
- Mobile responsive: both widths become 100vw on <768px
- prefers-reduced-motion: instant appear, no animations
- Placeholder content (real renderers in later stories)
- Export CardHeaderProps interface from Card.tsx
- Add responsive panel width CSS rules
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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