feat(ui): cohesive frontend polish — design system + per-screen refinement

Distill the UI into a single, recognizable voice: a precision
instrument for one operator on one machine. Bloomberg-coded chrome,
warm-paper detail surfaces, mono-heavy numerics, with one editorial
serif accent for moments of weight.

Design system
- Three-font stack: Geist Sans (UI), Geist Mono (data), Instrument
  Serif (editorial display). No Inter, no system fonts.
- Two surfaces: dark chrome (--background, --accent, --signal) and
  warm paper detail surfaces (--surface, --surface-ink*).
- Inbox has its own Ticker Tape terminal palette (--tt-*).
- Shared component classes: .eyebrow, .mono, .display, .surface,
  .surface-2, .row-hover, .nav-active, .kbd, .editorial, .hairline.
- --m-* token aliases for the legacy drawer components so test-
  asserted class strings keep resolving to the same hue family.

Drawers (Claim + Remit)
- Editorial display face for totals (paid/adjustment amounts).
- Color-coded money tiles: green-tinted paid card, amber-tinted
  adjustment card when non-zero, muted otherwise.
- Tabs get accent-blue underline + CSS-driven active state.
- Validation banners with proper background opacity + ring-around-
  dot success badge.
- StateHistoryTimeline: dashed border, ring around dots, ↳ prefix
  for remit ids.
- DiagnosesList, PartiesGrid, MatchedRemitCard, CasAdjustmentsPanel:
  refined typography, dashed dividers, italic descriptions, mono
  amounts, font-semibold totals, hover row tints.

Inbox Ticker Tape
- Custom RowCheckbox with sr-only input + amber accent.
- Alternating row striping, hover tints, accent rail with inset
  shadow on selection.
- Refined sparkline with glow at high values.
- BulkBar: bottom-floating bar with amber count chip, larger shadow.
- CandidateBreakdown: animated progress bars with amber gradient.
- InboxHeader: Instrument Serif headline, mono day/date stamp,
  pulsing amber status dot.

Dialogs & search
- NewClaimDialog: editorial title, mono NPI/CPT/amount fields.
- SearchBar: refined input row with mono, footer with pulsing
  loading indicator.
- KeyboardCheatsheet: monogram icon chip, hover row states, refined
  eyebrow header.

Primitives
- StatusBadge / ClaimStateBadge: per-state dot indicators.
- SelectItem: data-[highlighted]:outline tokens for keyboard a11y.
- Table primitives: refined header treatment, hover/focus states.

Tests + build
- 354/354 tests passing across 59 files.
- Vite build clean (53.84 kB CSS / 560.86 kB JS).
- Eyebrow assertions updated to match the consolidated .eyebrow
  class (intact visual contract, abstracted class string).
- Badge variant tokens updated to the polished bg-muted/80 /
  /0.14 opacity scale.

src/components/ClaimDrawer/ValidationPanel.tsx

@@ -48,16 +48,15 @@ function IssueGroup({
     <div className="flex flex-col gap-1.5">
       <div className="flex items-center gap-2">
         <span
-          className="font-mono text-[12px] font-semibold tracking-tight text-[color:var(--m-ink-primary)]"
-          style={{ fontFamily: "var(--m-font-mono)" }}
+          className="mono text-[12px] font-semibold tracking-tight text-[color:var(--m-ink-primary)]"
         >
           {rule}
         </span>
         <span
-          className="inline-flex items-center rounded-full bg-[color:var(--m-ink-tertiary)]/15 px-1.5 text-[10.5px] font-medium text-[color:var(--m-ink-secondary)] tabular-nums"
+          className="inline-flex items-center rounded-full bg-[color:var(--m-ink-tertiary)]/15 px-1.5 py-0.5 text-[10px] font-medium text-[color:var(--m-ink-secondary)] tabular-nums"
           data-testid={`${testId}-count`}
         >
-          ({issues.length})
+          {issues.length}
         </span>
       </div>
       <ul className="flex flex-col gap-1.5 pl-1">
@@ -109,6 +108,9 @@ export function ValidationPanel({ validation }: ValidationPanelProps) {
         <span className="text-[13px] font-medium text-[color:var(--m-ink-primary)]">
           All checks passed
         </span>
+        <span className="ml-auto inline-flex items-center rounded-full bg-[color:var(--m-success)]/12 px-2 py-0.5 text-[10px] font-medium uppercase tracking-[0.14em] text-[color:var(--m-success)]">
+          Valid
+        </span>
       </section>
     );
   }
@@ -118,10 +120,10 @@ export function ValidationPanel({ validation }: ValidationPanelProps) {
 
   return (
     <section
-      className="flex flex-col gap-3 px-6 py-4 bg-[color:var(--m-surface)]"
+      className="flex flex-col gap-4 px-6 py-4 bg-[color:var(--m-surface)]"
       data-testid="validation-panel"
     >
-      <span className="text-[10.5px] font-semibold uppercase tracking-[0.18em] text-[color:var(--m-ink-tertiary)]">
+      <span className="eyebrow text-[color:var(--m-ink-tertiary)]">
         Validation
       </span>
 
@@ -130,7 +132,7 @@ export function ValidationPanel({ validation }: ValidationPanelProps) {
           data-testid="validation-errors"
           data-rule-group="errors"
           role="alert"
-          className="flex flex-col gap-2 border-l-2 border-[color:var(--m-error)] bg-[color:var(--m-error-bg)] px-3 py-2.5"
+          className="flex flex-col gap-3 border-l-2 border-[color:var(--m-error)] bg-[hsl(var(--destructive)/0.06)] px-3.5 py-3"
         >
           <div className="flex items-center gap-2">
             <AlertCircle
@@ -159,7 +161,7 @@ export function ValidationPanel({ validation }: ValidationPanelProps) {
         <div
           data-testid="validation-warnings"
           data-rule-group="warnings"
-          className="flex flex-col gap-2 border-l-2 border-[color:var(--m-warning)] bg-[color:var(--m-warning-bg)] px-3 py-2.5"
+          className="flex flex-col gap-3 border-l-2 border-[color:var(--m-warning)] bg-[hsl(var(--warning)/0.08)] px-3.5 py-3"
         >
           <div className="flex items-center gap-2">
             <AlertTriangle