feat: warn on the dashboard when a queen is 3+ years old

Queen.hatchYear was already captured but never used anywhere - no
signal existed for "this colony's queen is overdue for evaluation or
replacement," despite that being one of the most common productivity
and swarming risk factors in beekeeping. Adds an OLD_QUEEN dashboard
alert alongside the existing overdue-task/swarm-check ones, flagging
any active colony whose current queen has completed 3+ seasons.

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

ApiCore-Frontend/src/app/(app)/dashboard/page.tsx

@@ -66,6 +66,11 @@ const ALERT_META: Record<
     icon: Sprout,
     className: "border-destructive/30 bg-destructive/5",
   },
+  OLD_QUEEN: {
+    label: "Königin überaltert",
+    icon: Crown,
+    className: "border-warning/40 bg-warning/10",
+  },
 };
 
 export default function DashboardPage() {

ApiCore-Frontend/src/lib/dashboard/types.ts

@@ -11,7 +11,8 @@ export type DashboardAlertType =
   | "OVERDUE_TASK"
   | "COLONY_ATTENTION"
   | "LOW_STOCK"
-  | "OVERDUE_SWARM_CHECK";
+  | "OVERDUE_SWARM_CHECK"
+  | "OLD_QUEEN";
 
 export interface DashboardAlert {
   type: DashboardAlertType;