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/components/layout/RightContextPanel.tsx

@@ -32,8 +32,8 @@ export function RightContextPanel() {
         right: 0,
         top: 56,
         height: 'calc(100vh - 56px)',
-        width: 320,
-        transform: isRightPanelOpen ? 'translateX(0)' : 'translateX(320px)',
+        width: { xs: '85vw', sm: 300, lg: 320 },
+        transform: isRightPanelOpen ? 'translateX(0)' : 'translateX(110%)',
         transition: 'transform 0.25s ease',
         bgcolor: '#fff',
         borderLeft: '1px solid #e2e8f0',