feat: T4 wave 4 - rules suggest, takeover, chains, autopilot A1-A3, suggestions page, varroa bands UI

- Automation rules propose suggestions instead of creating tasks;
  notify per rule config; corrected varroa measurements refresh or
  resolve their suggestion
- Inspection values can be taken over into the colony card
  (occupiedFrames 0-40, strength deprecated); warning counts use the
  same visibility rule as the notification list
- Biotech chains: swarm check after queen cells, queen acceptance
  check, split schedules (raise own, queen cell, queen)
- Season autopilot core with A1 inspection due, A2 varroa measurement,
  A3 recheck after treatment; colony sync and daily step
- Frontend: suggestions page with groups, bulk accept, undo, paging,
  focus management and permission gating
- Frontend: varroa traffic light from seasonal bands, sample size,
  one range request for the colony chart
- Notifications: mark-read answers 404 for rows the user may no
  longer see

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

ApiCore-Frontend/src/lib/dates.spec.ts

@@ -1,5 +1,5 @@
 import { afterAll, afterEach, beforeAll, describe, expect, it, vi } from "vitest";
-import { toApiDate, toLocalIsoDate, todayLocalIsoDate } from "./dates";
+import { berlinCalendarDay, toApiDate, toLocalIsoDate, todayLocalIsoDate } from "./dates";
 
 /**
  * The beekeeper's phone runs in Europe/Berlin. Between 00:00 and 02:00 local
@@ -69,3 +69,12 @@ describe("local calendar dates", () => {
     expect(() => toApiDate("2026-02-30")).toThrow();
   });
 });
+
+describe("berlinCalendarDay", () => {
+  it("is the Berlin day whatever the device time zone", () => {
+    expect(berlinCalendarDay("2026-08-31T22:30:00.000Z")).toBe("2026-09-01");
+    expect(berlinCalendarDay("2026-12-31T23:30:00.000Z")).toBe("2027-01-01");
+    expect(berlinCalendarDay("2026-08-31T21:59:59.000Z")).toBe("2026-08-31");
+    expect(berlinCalendarDay("2026-06-15T00:00:00.000Z")).toBe("2026-06-15");
+  });
+});