feat: unit-first architecture — floor + street as primary card title

Every VERIFIED_PORTFOLIO property now has explicit units in mock data
(added to prop-002, prop-008, prop-009, prop-010, prop-011, prop-014).

PropertyUnit extracted to domain/unit.ts with formatFloorLabel,
formatUnitTitle, formatMultiUnitFloors helpers; re-exported from
property.ts so all existing imports are unaffected.

Cards now show floor + street as the primary title:
- Specific unit match: "1.OG Nord · Zollstrasse 12"
- Multi-unit (whole building): "1.OG–3.OG · Zollstrasse 12"
- EG retail: "EG Verkauf · Löwenplatz 3"
Building name (e.g. "Bürofläche Zollstrasse 12") appears as subtitle.
Both IntelligenceMatchCard (grid) and MatchCardCompact (list) updated.

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

src/components/match-card/MatchCardViewModel.ts

@@ -67,6 +67,9 @@ export interface MatchCardViewModel {
   signalIsControlled?: boolean
   signalAreaSqmEstimate?: number
 
+  // Unit-first display (primary)
+  propertySubtitle?: string  // building name shown below the unit title
+
   // Property / unit reference (for FUTURE_AVAILABILITY with a backing property)
   propertyId?: string
   unitId?: string