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/StateHistoryTimeline.tsx

@@ -64,7 +64,7 @@ export function StateHistoryTimeline({ history }: StateHistoryTimelineProps) {
     >
       <h3
         data-testid="section-label"
-        className="text-[10.5px] font-semibold uppercase tracking-[0.18em] text-[color:var(--m-ink-tertiary)]"
+        className="eyebrow text-[color:var(--m-ink-tertiary)]"
       >
         State History ({history.length})
       </h3>
@@ -79,7 +79,7 @@ export function StateHistoryTimeline({ history }: StateHistoryTimelineProps) {
       ) : (
         <ol
           data-testid="state-history-timeline"
-          className="relative ml-2 flex flex-col gap-3 border-l-2 border-[color:var(--m-border-heavy)] pl-5"
+          className="relative ml-2 flex flex-col gap-3.5 border-l border-dashed border-[color:var(--m-border-heavy)]/40 pl-6"
         >
           {history.map((event, i) => (
             <li
@@ -91,19 +91,18 @@ export function StateHistoryTimeline({ history }: StateHistoryTimelineProps) {
               <span
                 data-testid="state-history-dot"
                 aria-hidden
-                className={`absolute -left-[25px] top-1.5 h-2 w-2 rounded-full ${dotColorFor(event.kind)}`}
+                className={`absolute -left-[29px] top-1.5 h-2.5 w-2.5 rounded-full ring-4 ring-[color:var(--m-surface)] ${dotColorFor(event.kind)}`}
               />
               <div className="flex flex-wrap items-baseline gap-x-2 gap-y-0.5">
                 <span
                   data-testid="state-history-kind"
-                  className="text-[10px] font-semibold uppercase tracking-[0.14em] text-[color:var(--m-ink-tertiary)]"
+                  className="text-[10px] font-semibold uppercase tracking-[0.14em] text-[color:var(--m-ink-primary)]"
                 >
                   {kindLabel(event.kind)}
                 </span>
                 <span
                   data-testid="state-history-ts"
-                  className="font-mono text-xs text-[color:var(--m-ink-secondary)] tabular-nums"
-                  style={{ fontFamily: "var(--m-font-mono)" }}
+                  className="mono text-xs text-[color:var(--m-ink-secondary)] tabular-nums"
                 >
                   {fmt.date(event.ts)} · {fmt.time(event.ts)}
                 </span>
@@ -111,10 +110,9 @@ export function StateHistoryTimeline({ history }: StateHistoryTimelineProps) {
               {event.remittanceId ? (
                 <span
                   data-testid="history-remit-id"
-                  className="font-mono text-xs text-[color:var(--m-ink-tertiary)]"
-                  style={{ fontFamily: "var(--m-font-mono)" }}
+                  className="mono text-xs text-[color:var(--m-ink-tertiary)]"
                 >
-                  Remit {event.remittanceId}
+                  ↳ Remit {event.remittanceId}
                 </span>
               ) : null}
             </li>