feat: premium redesign — DM Serif, refined palette, flat score badges

- Design tokens (ds.ts, theme.ts, scoreTheme.ts): new warm palette
  (#152642 navy, #f9f8f6 warm white, #e8e7e4 borders, #b8975a gold accent),
  flat score tier badges replacing CSS gradients, Inter + DM Serif Display typography
- Card components: white-background cards, DM Serif score numbers, max-2 badge
  chips with +N overflow tooltip, editorial score badge positioning
- Layout shell: gold left-accent nav active state, 64px top bar, outlined
  workspace chip, DM Serif page titles
- Shared atoms: GenericBadge (outlined/solid variants), ResultFilterBar
  (simplified chip styles), DecisionContextPanel (dot metrics, no left accent)
- Global replacement (118 files): #1e3a5f→#152642, #e2e8f0→#e8e7e4,
  #f4f6f9→#f9f8f6 — all handled via Node.js for proper UTF-8 safety

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/components/ops/ReviewGatePanel.tsx

@@ -50,7 +50,7 @@ export function ReviewGatePanel({ gate }: ReviewGatePanelProps) {
 
         {reviewerNotes.length > 0 && (
           <Box sx={{ mt: 1, p: 1, bgcolor: 'rgba(30,58,95,0.04)', borderRadius: 1, border: '1px solid rgba(30,58,95,0.1)' }}>
-            <Typography variant="caption" sx={{ fontWeight: 600, color: '#1e3a5f', display: 'block', mb: 0.5 }}>
+            <Typography variant="caption" sx={{ fontWeight: 600, color: '#152642', display: 'block', mb: 0.5 }}>
               Reviewer-Informationen
             </Typography>
             {reviewerNotes.map((note, i) => (