Fixes:
- Chart hover dot now uses DOM element instead of SVG circle (no more squished dots)
- Chart hover line uses proper stroke-dasharray
- Tooltip positioning improved
New Components:
- Shimmer.tsx: Unified shimmer component for loading/locked states
- 404 Page: Professional not-found page with navigation options
Consistency improvements identified for future:
- All pages now use consistent Header/Footer
- Trend colors standardized (orange=up, green=down)
- Typography system follows design tokens
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