feat: Mietvertrag hinterlegen pro Objekt (Link + Bezeichnung)

- Property.leaseContractUrl? + leaseContractName? im Domain
- PropertyDetailOverview: Mietvertrag-Block in "Miet- & Mieterinformationen"
  — View-Modus: Öffnen-Button oder "Noch kein Vertrag"-Hinweis
  — Edit-Modus: URL-Feld + Bezeichnungsfeld (gespeichert via updateProperty)
- ReminderDetailDrawer: Mietvertrag-Link im "Objekt"-Abschnitt
  (lädt Property über usePropertyById)

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

src/components/supply/PropertyDetailOverview.tsx

@@ -1,4 +1,5 @@
-import { Box, Divider, LinearProgress, TextField, Typography } from '@mui/material'
+import { Box, Button, Divider, LinearProgress, TextField, Typography } from '@mui/material'
+import { ExternalLink, FileText, Plus } from 'lucide-react'
 import type { Property, UpdatePropertyInput } from '../../domain/property'
 import { PropertyMap } from '../shared'
 import { getAssetTypeLabel, qualityColor } from './propertyHelpers'
@@ -97,8 +98,32 @@ export function PropertyDetailOverview({ p, editing, draft, onDraftChange }: Pro
               onChange={e => onDraftChange({ ...draft, leaseEndDate: e.target.value })}
             />
           </Box>
+          <Box sx={{ display: 'flex', alignItems: 'center', gap: 0.75, mt: 0.5, mb: 0.5 }}>
+            <FileText size={13} color="#64748b" />
+            <Typography variant="caption" sx={{ fontWeight: 700, color: '#64748b', textTransform: 'uppercase', letterSpacing: 0.4 }}>
+              Mietvertrag
+            </Typography>
+          </Box>
+          <Box sx={{ display: 'grid', gridTemplateColumns: '1fr 1fr', gap: 1.5 }}>
+            <TextField
+              label="Vertrag URL"
+              size="small"
+              value={draft.leaseContractUrl ?? p.leaseContractUrl ?? ''}
+              onChange={e => onDraftChange({ ...draft, leaseContractUrl: e.target.value })}
+              placeholder="https://…"
+              slotProps={{ input: { startAdornment: <ExternalLink size={12} style={{ marginRight: 6, color: '#94a3b8', flexShrink: 0 }} /> } }}
+            />
+            <TextField
+              label="Bezeichnung (optional)"
+              size="small"
+              value={draft.leaseContractName ?? p.leaseContractName ?? ''}
+              onChange={e => onDraftChange({ ...draft, leaseContractName: e.target.value })}
+              placeholder="z.B. Mietvertrag 2021–2026"
+            />
+          </Box>
         </Box>
       ) : (
+        <>
           <FieldGrid>
             <Field label="Aktueller Mieter" value={p.currentTenant} />
             <Field label="Mietlaufzeit" value={p.leaseTerm} />
@@ -109,6 +134,39 @@ export function PropertyDetailOverview({ p, editing, draft, onDraftChange }: Pro
             <Field label="Importiert aus" value={p.importedFrom} />
             <Field label="Zuletzt aktualisiert" value={p.lastUpdatedAt ? new Date(p.lastUpdatedAt).toLocaleDateString('de-CH') : undefined} />
           </FieldGrid>
+
+          {/* Mietvertrag */}
+          <Box sx={{ mt: 1.5, p: 1.5, border: '1px solid #e2e8f0', borderRadius: 1.5, bgcolor: p.leaseContractUrl ? '#f8fafc' : '#fafafa' }}>
+            <Box sx={{ display: 'flex', alignItems: 'center', gap: 0.75, mb: p.leaseContractUrl ? 0.75 : 0 }}>
+              <FileText size={13} color={p.leaseContractUrl ? '#1e3a5f' : '#94a3b8'} />
+              <Typography variant="caption" sx={{ fontWeight: 700, color: p.leaseContractUrl ? '#1e3a5f' : '#94a3b8', textTransform: 'uppercase', letterSpacing: 0.4 }}>
+                Mietvertrag
+              </Typography>
+            </Box>
+            {p.leaseContractUrl ? (
+              <Box sx={{ display: 'flex', alignItems: 'center', justifyContent: 'space-between', gap: 1 }}>
+                <Typography variant="caption" sx={{ color: '#475569', fontWeight: 500 }} noWrap>
+                  {p.leaseContractName ?? 'Mietvertrag'}
+                </Typography>
+                <Button
+                  size="small"
+                  variant="outlined"
+                  endIcon={<ExternalLink size={11} />}
+                  href={p.leaseContractUrl}
+                  target="_blank"
+                  rel="noopener noreferrer"
+                  sx={{ textTransform: 'none', fontSize: '0.7rem', py: 0.25, px: 1, borderColor: '#cbd5e1', color: '#1e3a5f', whiteSpace: 'nowrap', flexShrink: 0 }}
+                >
+                  Öffnen
+                </Button>
+              </Box>
+            ) : (
+              <Typography variant="caption" sx={{ color: '#94a3b8' }}>
+                Noch kein Mietvertrag hinterlegt — im Bearbeitungsmodus hinzufügen.
+              </Typography>
+            )}
+          </Box>
+        </>
       )}
 
       {/* Floor / unit structure */}

src/components/supply/ReminderDetailDrawer.tsx

@@ -12,9 +12,10 @@ import {
   FormControlLabel,
   Tooltip,
 } from '@mui/material'
-import { X, MapPin, Calendar, DollarSign, Eye, Activity } from 'lucide-react'
+import { X, MapPin, Calendar, DollarSign, Eye, Activity, FileText, ExternalLink } from 'lucide-react'
 import { useReminderStore } from '../../stores/reminderStore'
 import { useReminder, useCompleteReminder, useDismissReminder, useSnoozeReminder } from '../../hooks/useReminders'
+import { usePropertyById } from '../../hooks/useProperties'
 import { ReminderPriorityBadge } from './ReminderPriorityBadge'
 import { ReminderTypeBadge } from './ReminderTypeBadge'
 import { ReminderDaysIndicator } from './ReminderDaysIndicator'
@@ -24,6 +25,7 @@ import { SHADOW_RISK_COLOR, SHADOW_RISK_LABEL, STATUS_CHIP_COLOR, STATUS_LABEL,
 export function ReminderDetailDrawer() {
   const { selectedId, drawerOpen, setDrawerOpen, setSelectedId } = useReminderStore()
   const { data: reminder } = useReminder(selectedId ?? '')
+  const { data: reminderProperty } = usePropertyById(reminder?.propertyId ?? '')
   const complete = useCompleteReminder()
   const dismiss = useDismissReminder()
   const snooze = useSnoozeReminder()
@@ -101,6 +103,27 @@ export function ReminderDetailDrawer() {
                 </Typography>
                 <Typography variant="caption" color="text.secondary">Mieter: {reminder.tenantName}</Typography>
                 <Typography variant="caption" color="text.secondary">Fläche: {reminder.areaSqm.toLocaleString('de-CH')} m²</Typography>
+                {reminderProperty?.leaseContractUrl ? (
+                  <Box sx={{ display: 'flex', alignItems: 'center', gap: 0.75, mt: 0.5 }}>
+                    <FileText size={12} color="#1e3a5f" />
+                    <Button
+                      size="small"
+                      variant="outlined"
+                      endIcon={<ExternalLink size={10} />}
+                      href={reminderProperty.leaseContractUrl}
+                      target="_blank"
+                      rel="noopener noreferrer"
+                      sx={{ textTransform: 'none', fontSize: '0.68rem', py: 0.125, px: 0.75, borderColor: '#cbd5e1', color: '#1e3a5f' }}
+                    >
+                      {reminderProperty.leaseContractName ?? 'Mietvertrag'}
+                    </Button>
+                  </Box>
+                ) : (
+                  <Box sx={{ display: 'flex', alignItems: 'center', gap: 0.5, mt: 0.5 }}>
+                    <FileText size={12} color="#cbd5e1" />
+                    <Typography variant="caption" sx={{ color: '#cbd5e1' }}>Kein Mietvertrag hinterlegt</Typography>
+                  </Box>
+                )}
               </Box>
             </Box>
 

src/domain/property.ts

@@ -135,6 +135,8 @@ export interface Property {
   description?: string
   images?: string[]
   floorPlanUrl?: string
+  leaseContractUrl?: string    // link to the signed lease document
+  leaseContractName?: string   // display label, e.g. "Mietvertrag 2021–2026"
 
   propertyNumber?: string
   units?: PropertyUnit[]