fix: T4 browser-check findings, interval on season state, T6 plan refresh

- Honey batch create omits an empty batch number (was 400); product form
  labels the legacy total weight, detail shows jar weight and shelf life;
  bottling hints next to their fields, values cleared on product change,
  post-save water-content wording; withdraw reason placeholder not
  selectable; honey batch actions offline-disabled with reason, 44 px.
- Offline signal: one slow request no longer flips the app offline; two
  consecutive timeouts do, any HTTP answer clears it, aborts never count.
- Phenology sheet as a side card on desktop with focus return; confirm
  dialogs as alertdialog; step-up texts in du-form ("Das Passwort stimmt
  nicht."); backup import gives its disabled reason; missing event labels
  plus a guard test; profile buttons 44 px.
- GET /phenology/state returns intervalDays via the shared
  inspectionIntervalOf (autopilot, digest, season state use one source).
- T6 plan aligned with the code after T4, plus owner decisions of
  2026-10-15 (Berlin day for restrictions, COMPLIANCE category, override
  without step-up).

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

ApiCore-Frontend/src/lib/system/labels.spec.ts

@@ -1,3 +1,5 @@
+import { existsSync, readFileSync } from "node:fs";
+import { resolve } from "node:path";
 import { describe, expect, it } from "vitest";
 import {
   DOMAIN_EVENT_LABELS,
@@ -55,3 +57,20 @@ describe("system labels", () => {
     expect(formatAge(86400)).toBe("vor 1 Tag");
   });
 });
+
+describe("DOMAIN_EVENT_LABELS completeness", () => {
+  it("names PhenologyRecomputeRequested and WinterCheckRecorded", () => {
+    expect(DOMAIN_EVENT_LABELS.PhenologyRecomputeRequested).toBe("Saison neu berechnen angefordert");
+    expect(DOMAIN_EVENT_LABELS.WinterCheckRecorded).toBe("Winterkontrolle erfasst");
+  });
+
+  it("has a German label for every backend domain event type", () => {
+    const catalog = resolve(process.cwd(), "../ApiCore-Backend/src/domain-events/domain-event-types.ts");
+    if (!existsSync(catalog)) return; // frontend checked out alone
+    const source = readFileSync(catalog, "utf8");
+    const block = source.slice(source.indexOf("const CATALOG"), source.indexOf("DOMAIN_EVENT_TYPES"));
+    const types = [...block.matchAll(/^\s+([A-Z][A-Za-z]+): true,/gm)].map((match) => match[1]);
+    expect(types.length).toBeGreaterThan(20);
+    expect(types.filter((type) => !(type in DOMAIN_EVENT_LABELS))).toEqual([]);
+  });
+});