feat: add 'Zur Einheit →' CTA on all VERIFIED_PORTFOLIO cards

Every portfolio match card now shows a primary 'Zur Einheit →' button
that navigates to /demand/property/:propertyId?unit=:unitId, where the
user can see the unit table and contact management via the inquiry form.

'Details →' is demoted to secondary for portfolio cards (match analysis
still accessible, but unit/contact page is the primary action).
EXTERNAL_MARKET and MAISON_WORK cards are unchanged.

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

src/components/results/UnifiedResultCard.tsx

@@ -25,6 +25,8 @@ export function UnifiedResultCard({ result, view = 'list' }: Props) {
   const { openAddDialog } = useShortlistStore()
   const inCompare = isInCompare(result.matchId)
 
+  const isPortfolio = result.resultType === 'VERIFIED_PORTFOLIO'
+
   const actions: MatchCardAction[] = [
     {
       id: 'shortlist',
@@ -56,9 +58,22 @@ export function UnifiedResultCard({ result, view = 'list' }: Props) {
       id: 'details',
       label: 'Details →',
       actionType: 'OPEN_DETAIL',
-      variant: 'primary',
+      // Downgrade to secondary when the unit CTA is the primary action
+      variant: isPortfolio ? 'secondary' : 'primary',
       onClick: () => navigate(`/demand/results/${result.matchId}`),
     },
+    // Portfolio properties: direct link to unit page + management inquiry form
+    ...(isPortfolio ? [{
+      id: 'contact',
+      label: 'Zur Einheit →',
+      actionType: 'OPEN_DETAIL' as const,
+      variant: 'primary' as const,
+      onClick: () => {
+        const propId = result.property.id
+        const unitId = result.match.unitId
+        navigate(`/demand/property/${propId}${unitId ? `?unit=${unitId}` : ''}`)
+      },
+    }] : []),
   ]
 
   const vm = buildMatchCardViewModel(result, actions)