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/anfragencenter/MockPdfPreview.tsx

@@ -73,7 +73,7 @@ export function MockPdfPreview({ fields, fallbackFields }: MockPdfPreviewProps)
             variant="body2"
             sx={{ fontSize: '0.875rem', mb: 0.5, lineHeight: 1.5 }}
           >
-            <strong>{p.title}</strong> — {p.location.city}, {p.areaSqm.toLocaleString('de-CH')} m², CHF {p.rentPricePerSqm}/m²
+            <strong>{p.title}</strong> — {p.location.city}, {p.areaSqm.toLocaleString('de-CH')} m², CHF {p.rentPricePerSqm}/m²/Jahr
           </Typography>
         ))}
         {properties.length === 0 && (