Rebuilt the purple color palette from scratch using a 4-level luminance
scale (~3-5x jump per level: #06000f → #110028 → #1d0845 → #3a158a),
matching the approach of high-contrast Bootswatch dark themes (Darkly,
Cyborg). All contrast ratios are now WCAG-compliant: body text 16:1,
card header white text 8.5:1, primary button 5.5:1.
Chart axis improvements: Y-axis large numbers abbreviated (1.4M, 568K),
X-axis max 6 ticks at 30° rotation, Inter font throughout, dark-glass
tooltips, network_charts settings added to settings.json.tmpl with
transparent canvas background
davide
88cba13e77