fix: correct rent unit labels and monthly/annual calculation consistency

- NeedAlignmentPanel: display budget row in monthly (CHF/m²/Mt.) to match
  the Preis section, use exact division (no Math.round) to avoid 13×12≠152
- MatchDetailPropertySections + PropertyDetailPublicSections: replace
  Math.round(rentPricePerSqm/12) with exact division; show 2 decimal places
  when monthly is not a whole number (e.g. CHF 12.67 instead of CHF 13)
- Add /Jahr suffix to all 15 displays showing rentPricePerSqm or maxPerSqm
  without a time unit across results, compare, match-detail, supply, and
  anfragencenter components

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

src/components/supply/PropertyIntelligenceCard.tsx

@@ -92,7 +92,7 @@ export const PropertyIntelligenceCard = memo(function PropertyIntelligenceCard({
         {/* Key specs */}
         <Box sx={{ display: 'flex', gap: 0.5, flexWrap: 'wrap', mb: 1.25 }}>
           <Chip label={`${p.areaSqm} m²`} size="small" sx={{ fontSize: 11, bgcolor: '#f1f5f9', height: 22 }} />
-          <Chip label={`CHF ${p.rentPricePerSqm}/m²`} size="small" sx={{ fontSize: 11, bgcolor: '#f1f5f9', height: 22 }} />
+          <Chip label={`CHF ${p.rentPricePerSqm}/m²/Jahr`} size="small" sx={{ fontSize: 11, bgcolor: '#f1f5f9', height: 22 }} />
           {p.contractDurationMonths && (
             <Chip label={`${p.contractDurationMonths}M Vertrag`} size="small" sx={{ fontSize: 11, bgcolor: '#f1f5f9', height: 22 }} />
           )}