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/pages/supply/MyListings.tsx

@@ -104,7 +104,7 @@ function MatchListItem({
             sx={{
               textTransform: 'none',
               fontSize: '0.75rem',
-              bgcolor: '#1e3a5f',
+              bgcolor: '#152642',
               '&:hover': { bgcolor: '#162d4a' },
             }}
           >
@@ -351,7 +351,7 @@ export default function MyListings() {
           variant="contained"
           startIcon={<Plus size={16} />}
           onClick={() => navigate('/supply/new-listing')}
-          sx={{ bgcolor: '#1e3a5f', '&:hover': { bgcolor: '#162d4a' }, textTransform: 'none' }}
+          sx={{ bgcolor: '#152642', '&:hover': { bgcolor: '#162d4a' }, textTransform: 'none' }}
         >
           Neues Inserat
         </Button>