feat: platform backbone and field capture complete (checkpoint)

Platform backbone (plan 2026-10-13-plattform-rueckgrat), all tasks reviewed:
- webhooks with delivery table, retries and stable delivery id
- calendar handlers; a finished task removes its Outlook event
- tasks, automations, inspections, varroa, treatments, feedings,
  harvests, colonies, wintering, stock and bottling record domain events
  in the same transaction; legacy post-commit calls removed
- row locks through one helper (lockRowForUpdate, lockRowsForShare,
  lockRowsForUpdate)
- job framework with JobRun, cli exit codes, cleanup, task templates,
  daily evaluation, hourly app-backup and the rekey job
- system API and page "Verwaltung > System" with retry
- @nestjs/schedule removed, guard tests against in-process schedulers

Field capture T3 (plan 2026-10-13-t3-erfassung-am-stand), all tasks reviewed:
- inspection photo offline without metadata
- bulk capture for treatments, feedings and varroa (backend + frontend)
- offline stand mode with service worker, offline pages and packs
- offline session, cold start and logout on shared devices

Docs: ARCHITECTURE.md assumptions and sections updated, TASKS.md.
Gates: backend lint, typecheck, 1770 unit, 420 e2e, build, no schema
drift; frontend lint, typecheck, 913 tests, build. Not rolled out.

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

ApiCore-Frontend/src/lib/auth/api.spec.ts

@@ -1,7 +1,8 @@
-import { afterEach, beforeEach, describe, it, vi } from "vitest";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
 import {
   DEFAULT_TIMEOUT_MS,
   NON_IDEMPOTENT_WRITE_TIMEOUT_MS,
+  isNetworkError,
 } from "@/lib/http/fetch-with-timeout";
 import { expectTimeoutAt, stubHangingFetch } from "@/lib/http/deadline-test-helper";
 import {
@@ -42,3 +43,41 @@ describe("auth api timeouts", () => {
     await expectTimeoutAt(() => getCurrentUserRequest("tok"), DEFAULT_TIMEOUT_MS);
   });
 });
+
+describe("refreshRequest outcome", () => {
+  afterEach(() => {
+    vi.unstubAllGlobals();
+  });
+
+  function answerWith(status: number, body: unknown = {}) {
+    vi.stubGlobal(
+      "fetch",
+      vi.fn().mockResolvedValue(new Response(JSON.stringify(body), { status })),
+    );
+  }
+
+  it("returns the access token when the server accepts the session", async () => {
+    answerWith(200, { accessToken: "token-1" });
+
+    await expect(refreshRequest()).resolves.toEqual({ accessToken: "token-1" });
+  });
+
+  it.each([401, 403])("says the session is over for %i", async (status) => {
+    answerWith(status);
+
+    await expect(refreshRequest()).resolves.toBeNull();
+  });
+
+  it.each([429, 500, 502, 503, 504])(
+    "does not end the session for %i - the server was just unavailable",
+    async (status) => {
+      answerWith(status);
+
+      const failure = await refreshRequest().catch((error: unknown) => error);
+
+      expect(failure).toBeInstanceOf(Error);
+      // Treated like a lost connection by everything that retries or queues.
+      expect(isNetworkError(failure)).toBe(true);
+    },
+  );
+});