Add Niteshift Dials SDK for runtime design prototyping

Introduces a complete design dials system that allows designers and PMs
to adjust UI parameters at runtime without code changes.

**Dials SDK (`packages/dials/`):**
- useDynamicColor: Color values with design system integration
- useDynamicSpacing: Spacing/padding/margin controls
- useDynamicVariant: Discrete choice selections
- useDynamicBoolean: Toggle/feature flag controls
- useDynamicNumber: Numeric values with min/max/step
- DialsOverlay: Compact Leva-inspired UI (Ctrl+D to toggle)
- DialsProvider: React context for dial state management
- Design manifest integration for design system tokens

**App Integration:**
- Added DialsProvider to app Providers
- Example dials on WebsitePage (metrics bar, panels, navigation)
- MetricCard component with adjustable typography dials
- TypeScript manifest at src/config/niteshift-manifest.ts

**Documentation:**
- Comprehensive CLAUDE.md section on dials usage
- Best practices for preserving original appearance
- Examples for all dial types

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

packages/dials/src/__tests__/setup.ts

@@ -0,0 +1,10 @@
+/**
+ * Test setup file for Vitest
+ */
+
+import { afterEach } from 'vitest';
+
+// Clean up localStorage after each test
+afterEach(() => {
+  localStorage.clear();
+});