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/pages/demand/MatchDetail.tsx

@@ -108,7 +108,7 @@ export default function MatchDetail() {
       matchScore: match.matchScore,
       location: property?.location?.city,
       areaLabel: property?.areaSqm ? `${property.areaSqm.toLocaleString('de-CH')} m²` : undefined,
-      rentLabel: property?.rentPricePerSqm ? `CHF ${property.rentPricePerSqm}/m²` : undefined,
+      rentLabel: property?.rentPricePerSqm ? `CHF ${property.rentPricePerSqm}/m²/Jahr` : undefined,
     })
   }
 

src/pages/demand/Results.tsx

@@ -155,7 +155,7 @@ export default function Results() {
                   </Typography>
                   {activeNeed.budgetRange && activeNeed.budgetRange.maxPerSqm > 0 && (
                     <Typography variant="caption" color="text.secondary">
-                      <strong>Budget:</strong> max. CHF {activeNeed.budgetRange.maxPerSqm}/m²
+                      <strong>Budget:</strong> max. CHF {activeNeed.budgetRange.maxPerSqm}/m²/Jahr
                     </Typography>
                   )}
                   {activeNeed.timing?.earliestMoveIn && !isNaN(new Date(activeNeed.timing.earliestMoveIn).getTime()) && (