Redesign: phosphor-terminal identity and simplified 4-page structure

Information architecture (6 nav destinations -> 4):
- New Overview home: metric strip (live setups, high confidence,
  hit rate, expectancy), top-5 setups, watchlist pulse
- Market = Watchlist + Rankings merged as tabs; scoring weights
  moved into a collapsible disclosure
- Signals = Scanner + Performance merged as tabs (Setups | Track
  Record) with actions inside the panels
- Legacy routes redirect (/watchlist, /rankings, /scanner,
  /performance)

Visual identity:
- Warm ash-green dark palette replaces cold navy; citron lime
  accent replaces blue (Tailwind gray/blue remapped at config
  level so all components reskin)
- Primary buttons: lime with ink text; long/short stays
  emerald/red
- Typography: Bricolage Grotesque display, Instrument Sans body,
  IBM Plex Mono for all numerals incl. chart canvas labels
- Atmosphere: graph-paper grid + citron glow + film grain;
  pulsing brand dot; mono-numbered nav

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

frontend/src/components/ui/Badge.tsx

@@ -1,6 +1,6 @@
 const variantStyles: Record<string, string> = {
   auto: 'bg-blue-500/15 text-blue-400 border-blue-500/20',
-  manual: 'bg-sky-500/15 text-sky-400 border-sky-500/20',
+  manual: 'bg-amber-500/15 text-amber-400 border-amber-500/20',
   default: 'bg-white/[0.06] text-gray-400 border-white/[0.08]',
 };
 

frontend/src/components/ui/Field.tsx

@@ -24,7 +24,7 @@ export function Input({ className = '', ...rest }: InputHTMLAttributes<HTMLInput
 
 export function Select({ className = '', children, ...rest }: SelectHTMLAttributes<HTMLSelectElement>) {
   return (
-    <select className={`input-glass px-3 py-1.5 text-sm [&>option]:bg-[#0d1322] ${className}`} {...rest}>
+    <select className={`input-glass px-3 py-1.5 text-sm [&>option]:bg-[#151911] ${className}`} {...rest}>
       {children}
     </select>
   );