refactor: replace hardcoded hex colors with design tokens across priority components

- Add DS_COLORS.heat, DS_COLORS.futureCard, INQUIRY_STATUS_META tokens to ds.ts
- Eliminate 4 duplicate RESULT_TYPE_META / TYPE_META constants (now all use ds.ts)
- Eliminate 3 duplicate scoreColor / SCORE_COLOR functions (now all use matchScoreHex)
- HeatBadge: use DS_COLORS.heat.VERY_HOT / HOT tokens
- FutureAvailabilityCard: use DS_COLORS.futureCard.controlled / signal tokens
- IntelligenceMatchCard: import RESULT_TYPE_META from ds.ts, remove primary override
- MatchScoreDisplay: replace local scoreColor() with matchScoreHex()
- CompareColumnHeader: remove local TYPE_META + SCORE_COLOR, use ds.ts + utils.ts
- CompareTableBody: import RESULT_TYPE_META + matchScoreHex, fix #7c3aed → token
- compareUtils: remove TYPE_META + SCORE_COLOR, use dataQualityHex in scoreBar
- Anfragen + AnfragenInquiryItem: deduplicate STATUS_CONFIG → INQUIRY_STATUS_META
- Anfragen: #1e3a5f → 'primary.main', KI alert → futureCard.controlled tokens
- AnfragenMessageBubble: own-message bubble → 'primary.main', AI bubble → tokens
- ScoreBreakdownPanel: #1e3a5f → 'primary.main', #6d28d9 → futureCard.controlled
- ESLint: add warn rule against new hex colors in component sx props

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

eslint.config.js

@@ -19,4 +19,23 @@ export default defineConfig([
       globals: globals.browser,
     },
   },
+  // Discourage new hardcoded hex colors in components and pages.
+  // Use DS_COLORS, matchScoreHex(), RESULT_TYPE_META, or MUI theme tokens ("primary.main") instead.
+  // See src/lib/ds.ts and src/lib/utils.ts for available tokens.
+  {
+    files: ['src/components/**/*.{ts,tsx}', 'src/pages/**/*.{ts,tsx}'],
+    rules: {
+      'no-restricted-syntax': [
+        'warn',
+        {
+          selector: [
+            'Property[key.name=/^(bgcolor|color|borderColor|background|fill)$/]',
+            ' > Literal[value=/^#[0-9A-Fa-f]{3,8}$/]',
+          ].join(''),
+          message:
+            'Avoid hardcoded hex colors in sx props. Use DS_COLORS, matchScoreHex(), RESULT_TYPE_META, or MUI theme tokens ("primary.main") from src/lib/ds.ts and src/lib/utils.ts.',
+        },
+      ],
+    },
+  },
 ])