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/demand/WeightingEditor.tsx

@@ -109,7 +109,7 @@ export function WeightingEditor({ weights, onChange, assetType }: Props) {
       </Box>
 
       <Card sx={{ p: 3 }}>
-        <SliderGroup label="Harte Kriterien" keys={HARD_KEYS} raw={raw} onSlider={handleSlider} color="#1e3a5f" />
+        <SliderGroup label="Harte Kriterien" keys={HARD_KEYS} raw={raw} onSlider={handleSlider} color="#152642" />
         <Divider sx={{ my: 2.5 }} />
         <SliderGroup label="Weiche Kriterien" keys={SOFT_KEYS} raw={raw} onSlider={handleSlider} color="#7c3aed" />
       </Card>