Follow the Stitch "Daylight" design: light canvas, white panels with
hairline borders, deep cyan primary, Inter for UI text and JetBrains Mono
for numbers (bundled via @fontsource-variable).
- Override Element Plus variables in one place and derive light/dark
shades with color-mix; pages use the UnoCSS Tailwind palette.
- Replace the sidebar with a horizontal top navigation bar.
- Rebuild the demo trading page: status panel with metric tiles,
positions table, and a three-column layout (symbols, plan card,
open orders and timeline); restyle the analysis drawer.
- Fix the stale risk wording in the trading capital dialog.