refactor: architecture compliance pass — DS tokens, hook boundary, god component split, AI hardening

- DS token migration: Anfragen.tsx + child components (AnfragenInquiryItem, AnfragenMessageBubble)
  fully migrated; DS_TEXT.brandDark added; scoreTheme.ts moved to src/lib/ with re-export proxy
- Hook boundary: Results.tsx no longer calls needService directly — routes through useNeeds()
  with optional refetchOnMount/gcTime overrides
- NewListing.tsx (440L) split into useNewListingForm hook + 8 section components under
  src/components/new-listing/; page shell reduced to 121 lines
- AI hardening: Zod .strict() on all schemas, AIProvenance extended with schemaVersion/
  fallbackReason/traceId/latencyMs, AITraceStore stats with p50/p90/p99 + failure breakdowns,
  MockAIService buildFollowUpQuestions with priority ordering + area-ambiguity detection,
  prompt templates updated (LIGHT_INDUSTRIAL, budget unit, ambiguity detection, decimal precision)
- Tests: all 154 passing; fixed test regression caused by OfferEmailResponseSchema body min(50)

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

src/components/demand/AISearchSavePreview.tsx

@@ -0,0 +1,62 @@
+import { Alert, Box, Button, CircularProgress } from '@mui/material'
+import { Save } from 'lucide-react'
+import { NeedCardPreview } from './NeedCardPreview'
+import type { ParseNeedResult, ParsedNeedCriteria, WeightingKey } from '../../domain/needBuilder'
+
+interface Props {
+  criteria: ParsedNeedCriteria
+  weights: Record<WeightingKey, number>
+  parseResult: ParseNeedResult
+  needTitle: string
+  overallConfidence: number
+  isSaving: boolean
+  onNeedTitleChange: (t: string) => void
+  onBack: () => void
+  onSave: () => void
+}
+
+export function AISearchSavePreview({
+  criteria,
+  weights,
+  parseResult,
+  needTitle,
+  overallConfidence,
+  isSaving,
+  onNeedTitleChange,
+  onBack,
+  onSave,
+}: Props) {
+  return (
+    <Box sx={{ maxWidth: 1200, mx: 'auto' }}>
+      <Alert severity="success" sx={{ mb: 3 }}>
+        Dieses Suchprofil wird als aktiver Bedarf gespeichert und erscheint automatisch im Match Center der Verwaltung.
+      </Alert>
+      <NeedCardPreview
+        criteria={criteria}
+        weights={weights}
+        confidenceByField={parseResult.confidenceByField}
+        missingFields={parseResult.missingFields}
+        needTitle={needTitle}
+        onNeedTitleChange={onNeedTitleChange}
+      />
+      <Box sx={{ maxWidth: 720, mx: 'auto', display: 'flex', justifyContent: 'space-between', mt: 3 }}>
+        <Button variant="outlined" onClick={onBack} disabled={isSaving}>
+          ← Zurück
+        </Button>
+        <Button
+          variant="contained"
+          onClick={onSave}
+          disabled={isSaving}
+          endIcon={isSaving ? <CircularProgress size={16} color="inherit" /> : <Save size={16} />}
+          sx={{ bgcolor: '#1e3a5f', '&:hover': { bgcolor: '#162d4a' }, textTransform: 'none' }}
+        >
+          {isSaving
+            ? 'Wird gespeichert…'
+            : overallConfidence < 0.6
+              ? 'Als Entwurf speichern'
+              : 'Suchprofil speichern & Matching starten'}
+        </Button>
+      </Box>
+    </Box>
+  )
+}