Phase 1: Sidebar-Navigation, Dashboard-Cockpit & HTMX-Integration

- New sidebar layout (6 sections: Dashboard, Personen, Land, Finanzen, Dokumente, System)
- Collapsible sidebar with localStorage persistence
- Top bar with user dropdown and breadcrumbs
- Dashboard cockpit with live KPI cards (Destinataere, Foerderungen, Zahlungen, Laendereien)
- Action items: overdue Nachweise, pending payments, upcoming events, new emails, expiring leases
- Quick actions panel and recent audit log
- HTMX (2.0.4) and Alpine.js (3.14.8) integration via CDN
- django-htmx middleware and CSRF token setup
- Fix IMAP_PORT empty string handling in settings

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

app/stiftung/views/dashboard.py

@@ -1,5 +1,5 @@
 # views/dashboard.py
-# Phase 0: Vision 2026 – Code-Refactoring
+# Vision 2026 – Phase 1: Dashboard Cockpit
 
 import csv
 import io
@@ -59,38 +59,86 @@ from stiftung.forms import (
 
 @login_required
 def home(request):
-    """Home page for the Stiftungsverwaltung application"""
+    """Vision 2026 Dashboard Cockpit"""
     from stiftung.services.calendar_service import StiftungsKalenderService
-    
-    # Get upcoming events for the calendar widget
-    calendar_service = StiftungsKalenderService()
-    
-    # Get all events for the next 14 days
-    from datetime import timedelta
+
     today = timezone.now().date()
+    current_quarter = (today.month - 1) // 3 + 1
+    current_year = today.year
+
+    # ── Calendar events ──
+    calendar_service = StiftungsKalenderService()
     end_date = today + timedelta(days=14)
     all_events = calendar_service.get_all_events(today, end_date)
-    
-    # Filter for upcoming and overdue
     upcoming_events = [e for e in all_events if not getattr(e, 'overdue', False)]
     overdue_events = [e for e in all_events if getattr(e, 'overdue', False)]
-    
-    # Get current month events for mini calendar
-    from calendar import monthrange
-    _, last_day = monthrange(today.year, today.month)
-    month_start = today.replace(day=1)
-    month_end = today.replace(day=last_day)
-    current_month_events = calendar_service.get_all_events(month_start, month_end)
-    
+
+    # ── Stats ──
+    destinataer_count = Destinataer.objects.count()
+    paechter_count = Paechter.objects.count()
+    land_count = Land.objects.count()
+
+    # Active Foerderungen (not rejected/cancelled, current or future year)
+    foerderung_active = Foerderung.objects.filter(
+        jahr__gte=current_year,
+        status__in=['beantragt', 'genehmigt'],
+    ).count()
+
+    # ── Overdue Nachweise (current quarter) ──
+    overdue_nachweise = VierteljahresNachweis.objects.filter(
+        quartal=current_quarter,
+        jahr=current_year,
+        status__in=['offen', 'teilweise', 'nachbesserung'],
+    ).select_related('destinataer').order_by('jahr', 'quartal')[:10]
+
+    # ── Pending payments (not yet paid out) ──
+    pending_payments = DestinataerUnterstuetzung.objects.filter(
+        status__in=['geplant', 'faellig', 'in_bearbeitung'],
+    ).select_related('destinataer').order_by('faellig_am')[:10]
+
+    pending_payment_total = DestinataerUnterstuetzung.objects.filter(
+        status__in=['geplant', 'faellig', 'in_bearbeitung'],
+    ).aggregate(total=Coalesce(Sum('betrag'), Decimal('0')))['total']
+
+    # ── New emails ──
+    new_emails = DestinataerEmailEingang.objects.filter(
+        status='neu',
+    ).order_by('-eingangsdatum')[:5]
+    new_email_count = DestinataerEmailEingang.objects.filter(status='neu').count()
+
+    # ── Expiring leases (next 90 days) ──
+    lease_cutoff = today + timedelta(days=90)
+    expiring_leases = LandVerpachtung.objects.filter(
+        pachtende__lte=lease_cutoff,
+        pachtende__gte=today,
+    ).select_related('paechter', 'land').order_by('pachtende')[:5]
+
+    # ── Recent audit log ──
+    recent_audit = AuditLog.objects.order_by('-timestamp')[:5]
+
     context = {
-        "title": "Stiftungsverwaltung", 
-        "description": "Foundation Management System",
-        "upcoming_events": upcoming_events[:5],  # Show only 5 upcoming events
-        "overdue_events": overdue_events[:3],    # Show only 3 overdue events
-        "current_month_events": current_month_events,
+        "title": "Dashboard",
+        # Stats
+        "destinataer_count": destinataer_count,
+        "paechter_count": paechter_count,
+        "land_count": land_count,
+        "foerderung_active": foerderung_active,
+        # Calendar
+        "upcoming_events": upcoming_events[:5],
+        "overdue_events": overdue_events[:3],
         "today": today,
+        # Action items
+        "overdue_nachweise": overdue_nachweise,
+        "pending_payments": pending_payments,
+        "pending_payment_total": pending_payment_total,
+        "new_emails": new_emails,
+        "new_email_count": new_email_count,
+        "expiring_leases": expiring_leases,
+        "recent_audit": recent_audit,
+        "current_quarter": current_quarter,
+        "current_year": current_year,
     }
-    
+
     return render(request, "stiftung/home.html", context)
 
 
@@ -106,12 +154,7 @@ def health_check(request):
     )
 
 
-## Removed duplicate paperless_ping referencing non-existent PAPERLESS_URL
-
-
 # CSV Import Views
 @api_view(["GET"])
 def health(_request):
     return Response({"status": "ok"})
-
-