feat: platform backbone and field capture, first part (checkpoint)

Platform backbone (plan 2026-10-13-plattform-rueckgrat), reviewed tasks:
- run roles api/worker/job/all with shared startup checks (Task 1)
- schema and migration for DomainEvent, deliveries, JobRun, ThrottlerHit (Task 2)
- audit, notifications and domain events written in the same transaction (Task 3)
- dispatcher with SKIP LOCKED claims, retries and stale release (Task 4)
- worker building blocks: tick, LISTEN/NOTIFY wake-up, health (Task 5)
- worker process and entry points (Task 6)
- throttler counters in Postgres (Task 19)
- separate keys per purpose with key ring (Task 20)
- public origin page without exact location (Task 22)
- shop keys split into read and write (Task 23)
- Kustomize base, components, overlay encry, CI validation (Task 26)

Field capture T3 (plan 2026-10-13-t3-erfassung-am-stand), reviewed tasks:
- brood frames, read endpoints, apiary overview and offline pack
- network basics, offline queue v3, navigation sheets, form building blocks
- new inspection with last-time hints and weather, varroa per day,
  treatment prefill, apiary page with round
- inspection photo (Task 10) is implemented, review pending

Not rolled out. Remaining tasks follow in later commits.

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

ApiCore-Frontend/src/components/nav/nav-sheet.tsx

@@ -0,0 +1,70 @@
+"use client";
+
+import type { ComponentProps, ReactNode } from "react";
+import { Button } from "@/components/ui/button";
+import {
+  Sheet,
+  SheetClose,
+  SheetContent,
+  SheetHeader,
+  SheetTitle,
+} from "@/components/ui/sheet";
+
+/** A tappable row in a nav sheet: 56px high for gloved or hurried thumbs. */
+export const NAV_SHEET_ROW_CLASS =
+  "flex min-h-14 items-center gap-3 rounded-xl px-3 text-base font-medium focus-visible:ring-3 focus-visible:ring-ring/50 focus-visible:outline-none";
+
+interface NavSheetProps {
+  open: boolean;
+  onOpenChange: (open: boolean) => void;
+  /** The `SheetTrigger` that opens the sheet. */
+  trigger: ReactNode;
+  title: string;
+  /** Extra classes for the sheet panel. */
+  className?: string;
+  /** Where focus goes on close; by default back to the trigger. */
+  finalFocus?: ComponentProps<typeof SheetContent>["finalFocus"];
+  children: ReactNode;
+}
+
+/**
+ * The shared bottom sheet of „Mehr", „+ Neu" and the offline queue: a title,
+ * a German close button and a scroll area that clears the iOS home indicator.
+ */
+export function NavSheet({
+  open,
+  onOpenChange,
+  trigger,
+  title,
+  className,
+  finalFocus,
+  children,
+}: NavSheetProps) {
+  return (
+    <Sheet open={open} onOpenChange={onOpenChange}>
+      {trigger}
+      <SheetContent
+        side="bottom"
+        // The built-in close button is English; ours is German and 44px high.
+        showCloseButton={false}
+        finalFocus={finalFocus}
+        className={[
+          "max-h-[85dvh] gap-0 overflow-y-auto rounded-t-2xl pb-(--safe-area-bottom)",
+          className,
+        ]
+          .filter(Boolean)
+          .join(" ")}
+      >
+        <SheetHeader className="flex-row items-center justify-between">
+          <SheetTitle>{title}</SheetTitle>
+          <SheetClose
+            render={<Button variant="ghost" size="sm" className="min-h-11" />}
+          >
+            Schließen
+          </SheetClose>
+        </SheetHeader>
+        {children}
+      </SheetContent>
+    </Sheet>
+  );
+}