feat: T4 wave 6 - reminders and morning digest, next steps UI, warnings and notifications UI

- In-app reminders: task due (skips rescheduled tasks, catch-up wording)
  and a per-user morning digest step in the daily job
- Frontend: "Als Nächstes" on the colony page, "Heute" on the dashboard,
  inspection-due card, season chip, apiary overview fields, cleanup
  sheet for ended colonies
- Frontend: plausibility warnings that stay until dismissed, withdrawal
  spans in the calendar, notification bell with categories and links,
  notification settings in the profile
- ARCHITECTURE.md: T4a sections 11.1-11.10, assumptions 31-41, handler
  table and daily job step order

Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>

ApiCore-Frontend/src/lib/tasks/api.ts

@@ -1,6 +1,10 @@
 import { apiFetch } from "@/lib/auth/api-client";
 import { CreateTaskInput, Task, TaskFilter, UpdateTaskInput } from "./types";
 
+export function fetchTask(id: string): Promise<Task> {
+  return apiFetch<Task>(`/tasks/${encodeURIComponent(id)}`);
+}
+
 export function fetchTasks(filter: TaskFilter): Promise<Task[]> {
   const params = new URLSearchParams();
   if (filter.status) params.set("status", filter.status);