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/compare/CompareColumnHeader.tsx

@@ -43,7 +43,7 @@ export function CompareColumnHeader({ item, onRemove }: Props) {
       propertyId: prop?.id,
       propertyAddress: prop ? `${title}, ${subtitle}${district ? `, ${district}` : ''}` : undefined,
       areaLabel: prop?.areaSqm ? `${prop.areaSqm.toLocaleString('de-CH')} m²` : undefined,
-      rentLabel: prop?.rentPricePerSqm ? `CHF ${prop.rentPricePerSqm}/m²` : undefined,
+      rentLabel: prop?.rentPricePerSqm ? `CHF ${prop.rentPricePerSqm}/m²/Jahr` : undefined,
       availabilityLabel: prop?.availabilityDate ?? undefined,
     })
   }

src/components/compare/CompareTableBody.tsx

@@ -155,7 +155,7 @@ export function CompareTableBody({
         return (
           <Box>
             <Typography variant="body2" sx={{ fontWeight: 600 }}>
-              CHF {prop.rentPricePerSqm}/m²
+              CHF {prop.rentPricePerSqm}/m²/Jahr
             </Typography>
             {prop.totalRentMonthly && (
               <Typography variant="caption" color="text.secondary">