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-Backend/src/season/inspection-due.spec.ts

@@ -1,5 +1,5 @@
 import { DEFAULT_INSPECTION_INTERVAL_CONFIG } from '../automation/rule-config/inspection-interval.config';
-import { inspectionDueOn } from './inspection-due';
+import { inspectionDueOn, inspectionIntervalOf } from './inspection-due';
 
 const CONFIG = DEFAULT_INSPECTION_INTERVAL_CONFIG;
 const SCHWARMZEIT = {
@@ -71,3 +71,19 @@ describe('inspectionDueOn', () => {
       ),
     ).toEqual({ dueOn: '2026-04-03', firstOfYear: false, intervalDays: 14 }));
 });
+
+describe('inspectionIntervalOf', () => {
+  const days = CONFIG.intervalDays;
+
+  it('is the configured interval of the segment', () => {
+    expect(inspectionIntervalOf('SCHWARMZEIT', days)).toBe(7);
+    expect(inspectionIntervalOf('SOMMER', days)).toBe(14);
+    expect(inspectionIntervalOf('HERBST', days)).toBe(21);
+  });
+
+  it('is null in WINTERRUHE', () =>
+    expect(inspectionIntervalOf('WINTERRUHE', days)).toBeNull());
+
+  it('is null while the rule is inactive', () =>
+    expect(inspectionIntervalOf('SCHWARMZEIT', days, false)).toBeNull());
+});