feat: anonymes Suchprofil — Toggle im Speichern-Schritt, supply-side Masking

- Toggle 'Anonymes Suchprofil' im AISearchSavePreview (nicht in Suchmaske)
- Box wechselt zu lila wenn aktiv, Text erklärt was anonymisiert wird
- isAnonymous wird via buildNeedInput in gespeichertes Need geschrieben
- MatchListCard + NeedSelectionPanel: zeigen 'Anonyme Anfrage' (lila) statt Firmenname

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

src/components/demand/AISearchSavePreview.tsx

@@ -1,4 +1,4 @@
-import { Alert, Box, Button, CircularProgress } from '@mui/material'
+import { Alert, Box, Button, CircularProgress, FormControlLabel, Switch, Typography } from '@mui/material'
 import { Save } from 'lucide-react'
 import { NeedCardPreview } from './NeedCardPreview'
 import type { ParseNeedResult, ParsedNeedCriteria, WeightingKey } from '../../domain/needBuilder'
@@ -10,7 +10,9 @@ interface Props {
   needTitle: string
   overallConfidence: number
   isSaving: boolean
+  isAnonymous: boolean
   onNeedTitleChange: (t: string) => void
+  onAnonymousChange: (v: boolean) => void
   onBack: () => void
   onSave: () => void
 }
@@ -22,7 +24,9 @@ export function AISearchSavePreview({
   needTitle,
   overallConfidence,
   isSaving,
+  isAnonymous,
   onNeedTitleChange,
+  onAnonymousChange,
   onBack,
   onSave,
 }: Props) {
@@ -39,7 +43,41 @@ export function AISearchSavePreview({
         needTitle={needTitle}
         onNeedTitleChange={onNeedTitleChange}
       />
-      <Box sx={{ maxWidth: 720, mx: 'auto', display: 'flex', justifyContent: 'space-between', mt: 3 }}>
+
+      {/* Anonymity option */}
+      <Box sx={{
+        maxWidth: 720, mx: 'auto', mt: 2,
+        p: 1.5, borderRadius: 1.5, border: '1px solid',
+        borderColor: isAnonymous ? '#7c3aed' : '#e2e8f0',
+        bgcolor: isAnonymous ? '#f5f3ff' : '#f8fafc',
+        transition: 'all 0.15s',
+      }}>
+        <FormControlLabel
+          control={
+            <Switch
+              size="small"
+              checked={isAnonymous}
+              onChange={e => onAnonymousChange(e.target.checked)}
+              sx={{
+                '& .MuiSwitch-switchBase.Mui-checked': { color: '#7c3aed' },
+                '& .MuiSwitch-switchBase.Mui-checked + .MuiSwitch-track': { bgcolor: '#7c3aed' },
+              }}
+            />
+          }
+          label={
+            <Box>
+              <Typography variant="body2" sx={{ fontWeight: 700, color: isAnonymous ? '#6d28d9' : 'text.primary' }}>
+                Anonymes Suchprofil
+              </Typography>
+              <Typography variant="caption" sx={{ color: isAnonymous ? '#7c3aed' : 'text.secondary' }}>
+                Firmenname wird nicht an Vermieter übermittelt — Verwalter sehen nur Branche und Flächenbedarf
+              </Typography>
+            </Box>
+          }
+        />
+      </Box>
+
+      <Box sx={{ maxWidth: 720, mx: 'auto', display: 'flex', justifyContent: 'space-between', mt: 2 }}>
         <Button variant="outlined" onClick={onBack} disabled={isSaving}>
           ← Zurück
         </Button>