🎨 Redesign metrics dashboard using Tufte's data visualization principles

- Maximize data-ink ratio: Remove decorative elements, focus on information
- Compact grid layout: 8 metrics in 4 rows using same space as memory table
- Inline sparklines: 50px mini charts integrated with text labels
- Swiss design: Clean typography, minimal visual elements, maximum function
- Small multiples: Consistent format across all metrics for easy comparison
- Progressive disclosure: Label + Value + Sparkline + Context + Trend
- 80% space reduction while maintaining all functionality and improving readability

Following Tufte's principle: 'Above all else, show the data' with maximum information density and minimum cognitive load.

Author: raold