fix: T4a browser check findings

- Withdrawal wording from one backend helper everywhere ("bis
  einschließlich TT.MM. – ab TT.MM. wieder erntefähig", year when it
  crosses New Year); withdrawal-status returns lastBlockedDay and the
  ready text, the frontend no longer computes dates
- Calendar events name colony or apiary, withdrawal events carry
  product and detail; compact withdrawal rows on mobile
- One bottling warning per colony and treatment; pre-save hint
- Offline: online-only actions disabled with a reason, cached data
  shows its timestamp, open sheets block submit offline
- Mobile: no horizontal scroll at 360 px, touch targets >= 44 px,
  toasts and the add button no longer cover content
- Cleanup sheet without destructive preselection; natural sort of
  colony codes; collapsible automation rule cards; varroa list newest
  first with chart axes; text fixes

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

ApiCore-Frontend/src/components/tab-switcher.spec.tsx

@@ -0,0 +1,21 @@
+import { describe, expect, it } from "vitest";
+import { render, screen } from "@testing-library/react";
+import { TabSwitcher } from "./tab-switcher";
+
+describe("TabSwitcher", () => {
+  it("makes every tab at least 44 px high for a thumb", () => {
+    render(
+      <TabSwitcher
+        tabs={[
+          { value: "a", label: "A" },
+          { value: "b", label: "B" },
+        ]}
+        value="a"
+        onChange={() => {}}
+      />,
+    );
+    for (const tab of screen.getAllByRole("tab")) {
+      expect(tab).toHaveClass("min-h-11", "sm:min-h-9");
+    }
+  });
+});