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/SearchResults.tsx

@@ -59,35 +59,35 @@ function ResultRow({
       }}
       onMouseEnter={() => onHover(index)}
       className={cn(
-        "w-full flex items-center gap-3 px-3 py-2 rounded-md text-left transition-colors",
+        "group w-full flex items-center gap-3 px-3 py-2 rounded-md text-left transition-colors",
         "focus:outline-none",
         selected
           ? "bg-accent/15 ring-1 ring-inset ring-accent/50"
-          : "hover:bg-muted/50"
+          : "hover:bg-muted/40"
       )}
     >
       <span
         className={cn(
-          "flex h-6 w-6 shrink-0 items-center justify-center rounded-md",
+          "flex h-6 w-6 shrink-0 items-center justify-center rounded-md transition-colors",
           selected
-            ? "bg-accent/20 text-accent"
-            : "bg-muted text-muted-foreground"
+            ? "bg-accent/25 text-accent"
+            : "bg-muted text-muted-foreground group-hover:bg-muted/70"
         )}
         aria-hidden
       >
         <Icon className="h-3.5 w-3.5" strokeWidth={1.75} />
       </span>
       <span className="min-w-0 flex-1">
-        <span className="block text-[13px] font-medium truncate">
+        <span className="block text-[13px] font-medium truncate text-foreground">
           {result.title}
         </span>
-        <span className="block text-[11px] font-mono text-muted-foreground truncate">
+        <span className="block text-[11px] mono text-muted-foreground truncate">
           {result.subtitle}
         </span>
       </span>
       <span
         className={cn(
-          "shrink-0 px-1.5 py-0.5 rounded text-[10px] font-mono uppercase tracking-[0.08em]",
+          "shrink-0 px-1.5 py-0.5 rounded text-[10px] mono uppercase tracking-[0.14em] font-medium",
           "bg-muted/70 text-muted-foreground"
         )}
       >
@@ -100,7 +100,8 @@ function ResultRow({
 /** Section header — small caps label above each group. */
 function GroupHeader({ label }: { label: string }) {
   return (
-    <div className="px-3 pt-3 pb-1.5 text-[10px] font-semibold uppercase tracking-[0.18em] text-muted-foreground">
+    <div className="px-4 pt-3 pb-1.5 flex items-center gap-2 text-[10.5px] font-semibold uppercase tracking-[0.18em] text-muted-foreground">
+      <span aria-hidden className="inline-block h-px w-3 bg-border" />
       {label}
     </div>
   );
@@ -109,11 +110,16 @@ function GroupHeader({ label }: { label: string }) {
 /** Render the "no matches" state. */
 function EmptyState({ query }: { query: string }) {
   return (
-    <div className="px-4 py-10 text-center text-muted-foreground">
-      <div className="text-[12px] font-mono">
-        {query
-          ? <>No matches for <span className="text-foreground">{query}</span></>
-          : "Type to search across claims, remittances, and activity."}
+    <div className="px-4 py-12 text-center text-muted-foreground">
+      <div className="mono text-[12px]">
+        {query ? (
+          <>
+            No matches for{" "}
+            <span className="text-foreground font-semibold">&ldquo;{query}&rdquo;</span>
+          </>
+        ) : (
+          "Type to search across claims, remittances, and activity."
+        )}
       </div>
     </div>
   );