feat: responsive layout + Reminder Manager redesign

- Auto-collapse sidebar at <1536px (all laptops), expand at ≥1536px
- Responsive drawer/panel widths across Pipeline, Properties, MyListings, Anfragen, MatchDetail, AISearch
- Reminder Manager: dot+label priority badge, Fläche column removed, status only for non-active rows
- ReminderKpiBar: focal Überfällig card, three secondary KPIs
- ReminderDetailDrawer: Task Panel redesign — Finanzen removed, Notiz promoted, Pre-Market as inline badge, full create form
- useCreateReminder hook wired to reminderService.create with cache invalidation
- Mock data: contract-derived reminders (LEASE_EXPIRY, BREAK_OPTION, RENT_REVIEW, INSURANCE_RENEWAL, SCHATTENMARKT_RELEASE) now show auto-creation note in Verlauf

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

src/pages/supply/Properties.tsx

@@ -247,7 +247,7 @@ export default function Properties() {
         anchor="right"
         open={!!selectedId}
         onClose={() => setSelectedId(null)}
-        slotProps={{ paper: { sx: { width: isMobile ? '100vw' : 650, boxShadow: '-4px 0 24px rgba(0,0,0,0.10)' } } }}
+        slotProps={{ paper: { sx: { width: isMobile ? '100vw' : { md: 520, lg: 580, xl: 640 }, boxShadow: '-4px 0 24px rgba(0,0,0,0.10)' } } }}
       >
         {selectedId && (
           <PropertyDetailView propertyId={selectedId} onClose={() => setSelectedId(null)} />