refactor: premium design polish — cards, results, grid view

- PropertyIntelligenceCard: aspect-ratio image, hover animation, compact
  data-completeness row, tighter body padding
- Results: replace verbose Card with compact active-search strip, remove
  DecisionContextPanel
- Properties: add 3/5/10 column toggle in grid view, persist to localStorage
- NeedInput, UnifiedResultCard/Feed, MatchCardViewModel: cleanup from
  earlier session

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

src/components/demand/NeedInput.tsx

@@ -1,5 +1,5 @@
 import { useState } from 'react'
-import { Box, Card, Chip, FormControlLabel, Slider, Stack, Switch, TextField, Typography } from '@mui/material'
+import { Box, Card, Chip, Slider, Stack, TextField, Typography } from '@mui/material'
 import type { ParsedNeedCriteria } from '../../domain/needBuilder'
 import { AssetType } from '../../domain/enums'
 import { NeedExtendedRequirements } from './NeedExtendedRequirements'
@@ -242,31 +242,7 @@ export function NeedInput({ criteria: c, onCriteriaChange: set }: Props) {
         </Stack>
       )}
 
-      {/* Anonymous search */}
-      <Box sx={{ display: 'flex', alignItems: 'center', justifyContent: 'space-between', mb: 1, mt: 0.5, py: 1, px: 1.5, borderRadius: 1.5, bgcolor: c.isAnonymous ? 'rgba(124,58,237,0.07)' : '#f8fafc', border: `1px solid ${c.isAnonymous ? '#7c3aed' : '#e8e7e4'}` }}>
-        <Box>
-          <Typography variant="caption" sx={{ fontWeight: 700, color: c.isAnonymous ? '#7c3aed' : '#334155' }}>
-            Anonyme Suche
-          </Typography>
-          <Typography variant="caption" color="text.secondary" sx={{ display: 'block', fontSize: '0.65rem' }}>
-            Firmenname wird nicht an Vermieter übermittelt
-          </Typography>
-        </Box>
-        <FormControlLabel
-          control={
-            <Switch
-              size="small"
-              checked={c.isAnonymous ?? false}
-              onChange={e => set({ ...c, isAnonymous: e.target.checked })}
-              sx={{ '& .MuiSwitch-thumb': { bgcolor: c.isAnonymous ? '#7c3aed' : undefined }, '& .Mui-checked + .MuiSwitch-track': { bgcolor: '#7c3aed' } }}
-            />
-          }
-          label=""
-          sx={{ m: 0 }}
-        />
-      </Box>
-
-      <NeedExtendedRequirements criteria={c} onChange={set} />
+<NeedExtendedRequirements criteria={c} onChange={set} />
     </Card>
   )
 }