feat: warn on the dashboard when a swarm check is overdue

Schwarmkontrolle already captures nextCheckDate per check, but it was
only ever visible by opening that one colony's tab. During swarm
season a missed follow-up check can mean losing half the colony, so
this now surfaces as a dashboard alert (OVERDUE_SWARM_CHECK) like
overdue tasks already do - only the most recent check per colony is
considered, so a completed follow-up clears the warning.

Co-Authored-By: Claude Sonnet 5 <[email protected]>

ApiCore-Backend/src/dashboard/dashboard.service.spec.ts

@@ -10,6 +10,7 @@ describe('DashboardService', () => {
     task: { count: jest.Mock; findMany: jest.Mock };
     honeyBatch: { count: jest.Mock };
     stockItem: { findMany: jest.Mock };
+    swarmControlCheck: { findMany: jest.Mock };
   };
 
   beforeEach(() => {
@@ -26,6 +27,7 @@ describe('DashboardService', () => {
       },
       honeyBatch: { count: jest.fn().mockResolvedValue(1) },
       stockItem: { findMany: jest.fn().mockResolvedValue([]) },
+      swarmControlCheck: { findMany: jest.fn().mockResolvedValue([]) },
     };
     service = new DashboardService(prisma as unknown as PrismaService);
   });
@@ -63,4 +65,46 @@ describe('DashboardService', () => {
       'LOW_STOCK',
     ]);
   });
+
+  it('flags a colony whose most recent swarm check is overdue', async () => {
+    prisma.swarmControlCheck.findMany.mockResolvedValue([
+      {
+        colonyId: 'colony-1',
+        nextCheckDate: new Date('2020-01-01'),
+        colony: { code: 'V-001' },
+      },
+    ]);
+
+    const alerts = await service.alerts();
+
+    expect(alerts).toEqual([
+      {
+        type: 'OVERDUE_SWARM_CHECK',
+        message: 'Schwarmkontrolle für Volk V-001 überfällig',
+        relatedType: 'Colony',
+        relatedId: 'colony-1',
+      },
+    ]);
+  });
+
+  it('ignores an overdue swarm check when a newer check already superseded it', async () => {
+    prisma.swarmControlCheck.findMany.mockResolvedValue([
+      {
+        colonyId: 'colony-1',
+        date: new Date('2026-06-10'),
+        nextCheckDate: null,
+        colony: { code: 'V-001' },
+      },
+      {
+        colonyId: 'colony-1',
+        date: new Date('2026-06-01'),
+        nextCheckDate: new Date('2020-01-01'),
+        colony: { code: 'V-001' },
+      },
+    ]);
+
+    const alerts = await service.alerts();
+
+    expect(alerts).toHaveLength(0);
+  });
 });