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/NegotiationInsightsPanel.tsx

@@ -50,7 +50,7 @@ export function NegotiationInsightsPanel({ property }: Props) {
           <Box sx={{ flex: 1, p: 1.5, bgcolor: '#f8fafc', borderRadius: 1.5, border: '1px solid #e2e8f0', minWidth: 120 }}>
             <Typography variant="caption" color="text.secondary">Ihr Preis</Typography>
             <Typography variant="h6" sx={{ fontWeight: 700, color: '#0f1923' }}>
-              CHF {property.rentPricePerSqm}/m²
+              CHF {property.rentPricePerSqm}/m²/Jahr
             </Typography>
           </Box>
           {marketRent && (
@@ -130,7 +130,7 @@ export function NegotiationInsightsPanel({ property }: Props) {
                   <Typography variant="caption" sx={{ fontWeight: 500 }}>{n.companyName}</Typography>
                   <Typography variant="caption" color="text.secondary" sx={{ display: 'block' }}>
                     {n.requiredArea?.min ?? 0}–{n.requiredArea?.max ?? 0} m²
-                    {n.budgetRange?.maxPerSqm ? ` · max. CHF ${n.budgetRange.maxPerSqm}/m²` : ''}
+                    {n.budgetRange?.maxPerSqm ? ` · max. CHF ${n.budgetRange.maxPerSqm}/m²/Jahr` : ''}
                   </Typography>
                 </Box>
                 <Chip

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 }} />
           )}