feat: Phase 2 — UI component enhancement with design tokens
**Design System (Phase 1 completion):**
- tokens.ts: 12-category token system (colors, typography, spacing, shadows, etc.)
- tokens.css: CSS variables with light/dark theme support
- App.vue: Integrated token system app-wide
**Shared Components (Phase 2):**
- SkeletonLoader.vue: 5 loader types (text, card, avatar, table, list)
- ErrorBoundary.vue: Error state recovery with retry
- ToastNotification.vue: Toast alerts with 4 types + auto-dismiss
- ToastContainer.vue: Toast provider with fixed positioning
- Modal.vue: Animated modal with 4 size variants
**Page Enhancements:**
- ShadowRunQueue.vue: Loading → Skeleton + Error → ErrorBoundary + Normal states
- ModelList.vue: Loading → Skeleton + Error → ErrorBoundary + Normal states
- ApprovalQueue.vue: Loading → Skeleton + Error → ErrorBoundary + Normal states
**Testing:**
- All 3 pages: ✅ 100% PASS (12/12 selectors)
- Playwright tests verify: loading, error, normal states
- All states render correctly with token-based styling
**Next: Phase 3 (2-4h)**
- Layout unification (sidebar, header, footer)
- Complete dark theme implementation
- Mobile responsiveness & navigation
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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